import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author caoash
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        FastScanner in = new FastScanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CGreenBin solver = new CGreenBin();
        solver.solve(1, in, out);
        out.close();
    }

    static class CGreenBin {
        public void solve(int testNumber, FastScanner br, PrintWriter pw) {
            HashMap<String, Integer> cnt = new HashMap<>();
            int n = br.nextInt();
            for (int i = 0; i < n; i++) {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            }
            long ans = 0;
            for (String curr : cnt.keySet()) {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            }
            pw.println(ans);
            pw.close();
        }

        long C(int n, int k) {
            long res = 1;
            for (int i = n - k + 1; i <= n; ++i)
                res *= i;
            for (int i = 2; i <= k; ++i)
                res /= i;
            return res;
        }

    }

    static class FastScanner {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private FastScanner.SpaceCharFilter filter;

        public FastScanner(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public String nextString() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Arrays; Arrays java.util import java.util.HashMap; HashMap java.util import java.util.InputMismatchException; InputMismatchException java.util import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        FastScanner in = new FastScanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CGreenBin solver = new CGreenBin();
        solver.solve(1, in, out);
        out.close();
    }

    static class CGreenBin {
        public void solve(int testNumber, FastScanner br, PrintWriter pw) {
            HashMap<String, Integer> cnt = new HashMap<>();
            int n = br.nextInt();
            for (int i = 0; i < n; i++) {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            }
            long ans = 0;
            for (String curr : cnt.keySet()) {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            }
            pw.println(ans);
            pw.close();
        }

        long C(int n, int k) {
            long res = 1;
            for (int i = n - k + 1; i <= n; ++i)
                res *= i;
            for (int i = 2; i <= k; ++i)
                res /= i;
            return res;
        }

    }

    static class FastScanner {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private FastScanner.SpaceCharFilter filter;

        public FastScanner(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public String nextString() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        FastScanner in = new FastScanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CGreenBin solver = new CGreenBin();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        FastScanner in = new FastScanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CGreenBin solver = new CGreenBin();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out FastScanner in = new FastScanner(inputStream); in new FastScanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) CGreenBin solver = new CGreenBin(); solver new CGreenBin() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class CGreenBin {
        public void solve(int testNumber, FastScanner br, PrintWriter pw) {
            HashMap<String, Integer> cnt = new HashMap<>();
            int n = br.nextInt();
            for (int i = 0; i < n; i++) {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            }
            long ans = 0;
            for (String curr : cnt.keySet()) {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            }
            pw.println(ans);
            pw.close();
        }

        long C(int n, int k) {
            long res = 1;
            for (int i = n - k + 1; i <= n; ++i)
                res *= i;
            for (int i = 2; i <= k; ++i)
                res /= i;
            return res;
        }

    } CGreenBin public void solve(int testNumber, FastScanner br, PrintWriter pw) {
            HashMap<String, Integer> cnt = new HashMap<>();
            int n = br.nextInt();
            for (int i = 0; i < n; i++) {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            }
            long ans = 0;
            for (String curr : cnt.keySet()) {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            }
            pw.println(ans);
            pw.close();
        } solve {
            HashMap<String, Integer> cnt = new HashMap<>();
            int n = br.nextInt();
            for (int i = 0; i < n; i++) {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            }
            long ans = 0;
            for (String curr : cnt.keySet()) {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            }
            pw.println(ans);
            pw.close();
        } HashMap<String, Integer> cnt = new HashMap<>(); cnt new HashMap<>() int n = br.nextInt(); n br.nextInt() br.nextInt br for (int i = 0; i < n; i++) {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            } {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            } char[] in = br.nextString().toCharArray(); in br.nextString().toCharArray() br.nextString().toCharArray br.nextString() br.nextString br Arrays.sort(in) Arrays.sort Arrays in StringBuilder curr = new StringBuilder(); curr new StringBuilder() for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                } int j = 0; int j = 0; j 0 j < in.length j in.length in in.length j++ j++ j {
                    curr.append(in[j]);
                } {
                    curr.append(in[j]);
                } curr.append(in[j]) curr.append curr in[j] in j if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                } cnt.containsKey(curr.toString()) cnt.containsKey cnt curr.toString() curr.toString curr {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } cnt.put(curr.toString(), cnt.get(curr.toString()) + 1) cnt.put cnt curr.toString() curr.toString curr cnt.get(curr.toString()) + 1 cnt.get(curr.toString()) cnt.get cnt curr.toString() curr.toString curr 1 {
                    cnt.put(curr.toString(), 1);
                } cnt.put(curr.toString(), 1) cnt.put cnt curr.toString() curr.toString curr 1 long ans = 0; ans 0 for (String curr : cnt.keySet()) {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            } String curr cnt.keySet() cnt.keySet cnt {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            } {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            } Integer val = cnt.get(curr); val cnt.get(curr) cnt.get cnt curr if (val <= 1) {
                    continue;
                } val <= 1 val 1 {
                    continue;
                } continue; ans += C(val, 2) ans C(val, 2) C val 2 pw.println(ans) pw.println pw ans pw.close() pw.close pw int testNumber testNumber FastScanner br br PrintWriter pw pw long C(int n, int k) {
            long res = 1;
            for (int i = n - k + 1; i <= n; ++i)
                res *= i;
            for (int i = 2; i <= k; ++i)
                res /= i;
            return res;
        } C {
            long res = 1;
            for (int i = n - k + 1; i <= n; ++i)
                res *= i;
            for (int i = 2; i <= k; ++i)
                res /= i;
            return res;
        } long res = 1; res 1 for (int i = n - k + 1; i <= n; ++i)
                res *= i; int i = n - k + 1; int i = n - k + 1; i n - k + 1 n - k n k 1 i <= n i n ++i ++i i res *= i; res *= i res i for (int i = 2; i <= k; ++i)
                res /= i; int i = 2; int i = 2; i 2 i <= k i k ++i ++i i res /= i; res /= i res i return res; res int n n int k k static class FastScanner {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private FastScanner.SpaceCharFilter filter;

        public FastScanner(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public String nextString() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    } FastScanner private InputStream stream; stream private byte[] buf = new byte[1024]; buf new byte[1024] 1024 private int curChar; curChar private int numChars; numChars private FastScanner.SpaceCharFilter filter; filter public FastScanner(InputStream stream) {
            this.stream = stream;
        } FastScanner {
            this.stream = stream;
        } this.stream = stream this.stream this this.stream stream InputStream stream stream public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        } read {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        } if (numChars == -1) {
                throw new InputMismatchException();
            } numChars == -1 numChars -1 1 {
                throw new InputMismatchException();
            } throw new InputMismatchException(); new InputMismatchException() if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            } curChar >= numChars curChar numChars {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            } curChar = 0 curChar 0 try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                } catch (IOException e) {
                    throw new InputMismatchException();
                } IOException e {
                    throw new InputMismatchException();
                } throw new InputMismatchException(); new InputMismatchException() {
                    numChars = stream.read(buf);
                } numChars = stream.read(buf) numChars stream.read(buf) stream.read stream buf if (numChars <= 0) {
                    return -1;
                } numChars <= 0 numChars 0 {
                    return -1;
                } return -1; -1 1 return buf[curChar++]; buf[curChar++] buf curChar++ curChar public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        } nextInt {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        } int c = read(); c read() read while (isSpaceChar(c)) {
                c = read();
            } isSpaceChar(c) isSpaceChar c {
                c = read();
            } c = read() c read() read int sgn = 1; sgn 1 if (c == '-') {
                sgn = -1;
                c = read();
            } c == '-' c '-' {
                sgn = -1;
                c = read();
            } sgn = -1 sgn -1 1 c = read() c read() read int res = 0; res 0 do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c)); !isSpaceChar(c) isSpaceChar(c) isSpaceChar c {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                } c < '0' || c > '9' c < '0' c '0' c > '9' c '9' {
                    throw new InputMismatchException();
                } throw new InputMismatchException(); new InputMismatchException() res *= 10 res 10 res += c - '0' res c - '0' c '0' c = read() c read() read return res * sgn; res * sgn res sgn public String nextString() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        } nextString {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        } int c = read(); c read() read while (isSpaceChar(c)) {
                c = read();
            } isSpaceChar(c) isSpaceChar c {
                c = read();
            } c = read() c read() read StringBuilder res = new StringBuilder(); res new StringBuilder() do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c)); !isSpaceChar(c) isSpaceChar(c) isSpaceChar c {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                } Character.isValidCodePoint(c) Character.isValidCodePoint Character c {
                    res.appendCodePoint(c);
                } res.appendCodePoint(c) res.appendCodePoint res c c = read() c read() read return res.toString(); res.toString() res.toString res public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        } isSpaceChar {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        } if (filter != null) {
                return filter.isSpaceChar(c);
            } filter != null filter null {
                return filter.isSpaceChar(c);
            } return filter.isSpaceChar(c); filter.isSpaceChar(c) filter.isSpaceChar filter c return isWhitespace(c); isWhitespace(c) isWhitespace c int c c public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        } isWhitespace {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        } return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1; c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1 c == '\t' c == '\r' c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1 c == ' ' c ' ' c == '\n' c '\n' c == '\r' c '\r' c == '\t' c '\t' c == -1 c -1 1 int c c public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        } SpaceCharFilter public boolean isSpaceChar(int ch); isSpaceChar int ch ch public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        FastScanner in = new FastScanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CGreenBin solver = new CGreenBin();
        solver.solve(1, in, out);
        out.close();
    }

    static class CGreenBin {
        public void solve(int testNumber, FastScanner br, PrintWriter pw) {
            HashMap<String, Integer> cnt = new HashMap<>();
            int n = br.nextInt();
            for (int i = 0; i < n; i++) {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            }
            long ans = 0;
            for (String curr : cnt.keySet()) {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            }
            pw.println(ans);
            pw.close();
        }

        long C(int n, int k) {
            long res = 1;
            for (int i = n - k + 1; i <= n; ++i)
                res *= i;
            for (int i = 2; i <= k; ++i)
                res /= i;
            return res;
        }

    }

    static class FastScanner {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private FastScanner.SpaceCharFilter filter;

        public FastScanner(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public String nextString() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        FastScanner in = new FastScanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CGreenBin solver = new CGreenBin();
        solver.solve(1, in, out);
        out.close();
    }

    static class CGreenBin {
        public void solve(int testNumber, FastScanner br, PrintWriter pw) {
            HashMap<String, Integer> cnt = new HashMap<>();
            int n = br.nextInt();
            for (int i = 0; i < n; i++) {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            }
            long ans = 0;
            for (String curr : cnt.keySet()) {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            }
            pw.println(ans);
            pw.close();
        }

        long C(int n, int k) {
            long res = 1;
            for (int i = n - k + 1; i <= n; ++i)
                res *= i;
            for (int i = 2; i <= k; ++i)
                res /= i;
            return res;
        }

    }

    static class FastScanner {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private FastScanner.SpaceCharFilter filter;

        public FastScanner(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public String nextString() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author caoash
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        FastScanner in = new FastScanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CGreenBin solver = new CGreenBin();
        solver.solve(1, in, out);
        out.close();
    }

    static class CGreenBin {
        public void solve(int testNumber, FastScanner br, PrintWriter pw) {
            HashMap<String, Integer> cnt = new HashMap<>();
            int n = br.nextInt();
            for (int i = 0; i < n; i++) {
                char[] in = br.nextString().toCharArray();
                Arrays.sort(in);
                StringBuilder curr = new StringBuilder();
                for (int j = 0; j < in.length; j++) {
                    curr.append(in[j]);
                }
                if (cnt.containsKey(curr.toString())) {
                    cnt.put(curr.toString(), cnt.get(curr.toString()) + 1);
                } else {
                    cnt.put(curr.toString(), 1);
                }
            }
            long ans = 0;
            for (String curr : cnt.keySet()) {
                Integer val = cnt.get(curr);
                if (val <= 1) {
                    continue;
                }
                ans += C(val, 2);
            }
            pw.println(ans);
            pw.close();
        }

        long C(int n, int k) {
            long res = 1;
            for (int i = n - k + 1; i <= n; ++i)
                res *= i;
            for (int i = 2; i <= k; ++i)
                res /= i;
            return res;
        }

    }

    static class FastScanner {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private FastScanner.SpaceCharFilter filter;

        public FastScanner(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public String nextString() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }
}

