//master
import java.io.*;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.*;

class Pair {
    int a,b;
    Pair(int a, int b){
        this.a = a;
        this.b = b;
    }
}
public class Main {
    static int[][] memo;
    public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        String[] c = new String[n];
        for(int i = 0; i<n; i++) {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        }
        Arrays.sort(c);
        //for(String s:c)p(s);
        long ans = 0;
        long cnt = 1;
        for(int i = 0; i<n-1; i++) {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        }
        ans +=(cnt)*(cnt-1)/2;
        p(ans);
    }

    public static <T> void p(T message) {
        System.out.println(message);
    }

    public static <T> void pe(T message) {
        System.err.println(message);
    }

    public static <T> void pp(T message) {
        System.out.print(message);
    }
    
}
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
 
    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }
 
    private boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }
 
    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    }
 
    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
 
    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
 
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    }
 
    public double nextDouble() {
        return Double.parseDouble(next());
    }
} import java.io.*; io.* java import java.math.BigDecimal; BigDecimal java.math import java.math.RoundingMode; RoundingMode java.math import java.util.*; util.* java class Pair {
    int a,b;
    Pair(int a, int b){
        this.a = a;
        this.b = b;
    }
} Pair int a a b; b Pair(int a, int b){
        this.a = a;
        this.b = b;
    } Pair {
        this.a = a;
        this.b = b;
    } this.a = a this.a this this.a a this.b = b this.b this this.b b int a a int b b public class Main {
    static int[][] memo;
    public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        String[] c = new String[n];
        for(int i = 0; i<n; i++) {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        }
        Arrays.sort(c);
        //for(String s:c)p(s);
        long ans = 0;
        long cnt = 1;
        for(int i = 0; i<n-1; i++) {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        }
        ans +=(cnt)*(cnt-1)/2;
        p(ans);
    }

    public static <T> void p(T message) {
        System.out.println(message);
    }

    public static <T> void pe(T message) {
        System.err.println(message);
    }

    public static <T> void pp(T message) {
        System.out.print(message);
    }
    
} Main static int[][] memo; memo public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        String[] c = new String[n];
        for(int i = 0; i<n; i++) {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        }
        Arrays.sort(c);
        //for(String s:c)p(s);
        long ans = 0;
        long cnt = 1;
        for(int i = 0; i<n-1; i++) {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        }
        ans +=(cnt)*(cnt-1)/2;
        p(ans);
    } main {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        String[] c = new String[n];
        for(int i = 0; i<n; i++) {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        }
        Arrays.sort(c);
        //for(String s:c)p(s);
        long ans = 0;
        long cnt = 1;
        for(int i = 0; i<n-1; i++) {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        }
        ans +=(cnt)*(cnt-1)/2;
        p(ans);
    } FastScanner sc = new FastScanner(); sc new FastScanner() int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc String[] c = new String[n]; c new String[n] n for(int i = 0; i<n; i++) {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        } int i = 0; int i = 0; i 0 i<n i n i++ i++ i {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        } {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        } char[] cc = sc.next().toCharArray(); cc sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc Arrays.sort(cc) Arrays.sort Arrays cc c[i] = new String(cc) c[i] c i new String(cc) Arrays.sort(c) Arrays.sort Arrays c long ans = 0; ans 0 long cnt = 1; cnt 1 for(int i = 0; i<n-1; i++) {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        } int i = 0; int i = 0; i 0 i<n-1 i n-1 n 1 i++ i++ i {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        } {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        } if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            } !c[i].equals(c[i+1]) c[i].equals(c[i+1]) c[i].equals c[i] c i c[i+1] c i+1 i 1 {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            } ans +=(cnt)*(cnt-1)/2 ans (cnt)*(cnt-1)/2 (cnt)*(cnt-1) (cnt) (cnt-1) cnt 1 2 cnt=0 cnt 0 cnt++ cnt ans +=(cnt)*(cnt-1)/2 ans (cnt)*(cnt-1)/2 (cnt)*(cnt-1) (cnt) (cnt-1) cnt 1 2 p(ans) p ans String[] args args public static <T> void p(T message) {
        System.out.println(message);
    } p {
        System.out.println(message);
    } System.out.println(message) System.out.println System.out System System.out message T message message public static <T> void pe(T message) {
        System.err.println(message);
    } pe {
        System.err.println(message);
    } System.err.println(message) System.err.println System.err System System.err message T message message public static <T> void pp(T message) {
        System.out.print(message);
    } pp {
        System.out.print(message);
    } System.out.print(message) System.out.print System.out System System.out message T message message class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
 
    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }
 
    private boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }
 
    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    }
 
    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
 
    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
 
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    }
 
    public double nextDouble() {
        return Double.parseDouble(next());
    }
} FastScanner private final InputStream in = System.in; in System.in System System.in private final byte[] buffer = new byte[1024]; buffer new byte[1024] 1024 private int ptr = 0; ptr 0 private int buflen = 0; buflen 0 private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    } hasNextByte {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    } if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        } ptr < buflen ptr buflen {
            return true;
        } return true; true {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        } ptr = 0 ptr 0 try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } IOException e {
                e.printStackTrace();
            } e.printStackTrace() e.printStackTrace e {
                buflen = in.read(buffer);
            } buflen = in.read(buffer) buflen in.read(buffer) in.read in buffer if (buflen <= 0) {
                return false;
            } buflen <= 0 buflen 0 {
                return false;
            } return false; false return true; true private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    } readByte {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    } if (hasNextByte())
            return buffer[ptr++];
        else
            return -1; hasNextByte() hasNextByte return buffer[ptr++]; buffer[ptr++] buffer ptr++ ptr return -1; -1 1 private boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    } isPrintableChar {
        return 33 <= c && c <= 126;
    } return 33 <= c && c <= 126; 33 <= c && c <= 126 33 <= c 33 c c <= 126 c 126 int c c public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    } hasNext {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    } while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++; hasNextByte() && !isPrintableChar(buffer[ptr]) hasNextByte() hasNextByte !isPrintableChar(buffer[ptr]) isPrintableChar(buffer[ptr]) isPrintableChar buffer[ptr] buffer ptr ptr++ ptr return hasNextByte(); hasNextByte() hasNextByte public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    } next {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    } if (!hasNext())
            throw new NoSuchElementException(); !hasNext() hasNext() hasNext throw new NoSuchElementException(); new NoSuchElementException() StringBuilder sb = new StringBuilder(); sb new StringBuilder() int b = readByte(); b readByte() readByte while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        } isPrintableChar(b) isPrintableChar b {
            sb.appendCodePoint(b);
            b = readByte();
        } sb.appendCodePoint(b) sb.appendCodePoint sb b b = readByte() b readByte() readByte return sb.toString(); sb.toString() sb.toString sb public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    } nextLong {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    } if (!hasNext())
            throw new NoSuchElementException(); !hasNext() hasNext() hasNext throw new NoSuchElementException(); new NoSuchElementException() long n = 0; n 0 boolean minus = false; minus false int b = readByte(); b readByte() readByte if (b == '-') {
            minus = true;
            b = readByte();
        } b == '-' b '-' {
            minus = true;
            b = readByte();
        } minus = true minus true b = readByte() b readByte() readByte if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        } b < '0' || '9' < b b < '0' b '0' '9' < b '9' b {
            throw new NumberFormatException();
        } throw new NumberFormatException(); new NumberFormatException() while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        } true {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        } if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            } '0' <= b && b <= '9' '0' <= b '0' b b <= '9' b '9' {
                n *= 10;
                n += b - '0';
            } n *= 10 n 10 n += b - '0' n b - '0' b '0' if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            } b == -1 || !isPrintableChar(b) b == -1 b -1 1 !isPrintableChar(b) isPrintableChar(b) isPrintableChar b {
                return minus ? -n : n;
            } return minus ? -n : n; minus ? -n : n minus -n n n {
                throw new NumberFormatException();
            } throw new NumberFormatException(); new NumberFormatException() b = readByte() b readByte() readByte public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    } nextInt {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    } long nl = nextLong(); nl nextLong() nextLong if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException(); nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE nl < Integer.MIN_VALUE nl Integer.MIN_VALUE Integer Integer.MIN_VALUE nl > Integer.MAX_VALUE nl Integer.MAX_VALUE Integer Integer.MAX_VALUE throw new NumberFormatException(); new NumberFormatException() return (int) nl; (int) nl public double nextDouble() {
        return Double.parseDouble(next());
    } nextDouble {
        return Double.parseDouble(next());
    } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next public class Main {
    static int[][] memo;
    public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        String[] c = new String[n];
        for(int i = 0; i<n; i++) {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        }
        Arrays.sort(c);
        //for(String s:c)p(s);
        long ans = 0;
        long cnt = 1;
        for(int i = 0; i<n-1; i++) {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        }
        ans +=(cnt)*(cnt-1)/2;
        p(ans);
    }

    public static <T> void p(T message) {
        System.out.println(message);
    }

    public static <T> void pe(T message) {
        System.err.println(message);
    }

    public static <T> void pp(T message) {
        System.out.print(message);
    }
    
} public class Main {
    static int[][] memo;
    public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        String[] c = new String[n];
        for(int i = 0; i<n; i++) {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        }
        Arrays.sort(c);
        //for(String s:c)p(s);
        long ans = 0;
        long cnt = 1;
        for(int i = 0; i<n-1; i++) {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        }
        ans +=(cnt)*(cnt-1)/2;
        p(ans);
    }

    public static <T> void p(T message) {
        System.out.println(message);
    }

    public static <T> void pe(T message) {
        System.err.println(message);
    }

    public static <T> void pp(T message) {
        System.out.print(message);
    }
    
} Main
//master
import java.io.*;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.*;

class Pair {
    int a,b;
    Pair(int a, int b){
        this.a = a;
        this.b = b;
    }
}
public class Main {
    static int[][] memo;
    public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        String[] c = new String[n];
        for(int i = 0; i<n; i++) {
            char[] cc = sc.next().toCharArray();
            Arrays.sort(cc);
            c[i] = new String(cc);
        }
        Arrays.sort(c);
        //for(String s:c)p(s);
        long ans = 0;
        long cnt = 1;
        for(int i = 0; i<n-1; i++) {
            //p(c[i]);
            if(!c[i].equals(c[i+1])) {
                ans +=(cnt)*(cnt-1)/2;
                cnt=0;
            }
            cnt++;
        }
        ans +=(cnt)*(cnt-1)/2;
        p(ans);
    }

    public static <T> void p(T message) {
        System.out.println(message);
    }

    public static <T> void pe(T message) {
        System.err.println(message);
    }

    public static <T> void pp(T message) {
        System.out.print(message);
    }
    
}
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
 
    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }
 
    private boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }
 
    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    }
 
    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
 
    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
 
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    }
 
    public double nextDouble() {
        return Double.parseDouble(next());
    }
}
