import java.util.*;
import java.io.*;
public class B{
    static class InputReader {

        private final InputStream stream;
        private final byte[] buf = new byte[8192];
        private int curChar, snumChars;
        private SpaceCharFilter filter;

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

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

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

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

        public int[] nextIntArray(int n) {
            int a[] = new int[n];
            for (int i = 0; i < n; i++) {
                a[i] = nextInt();
            }
            return a;
        }

        public String readString() {
            int c = snext();
            while (isSpaceChar(c)) {
                c = snext();
            }
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = snext();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public String nextLine() {
            int c = snext();
            while (isSpaceChar(c))
                c = snext();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = snext();
            } while (!isEndOfLine(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        private boolean isEndOfLine(int c) {
            return c == '\n' || c == '\r' || c == -1;
        }

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

    }
    static class OutputWriter {
		private final PrintWriter writer;
 
		public OutputWriter(OutputStream outputStream) {
			writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
		}
 
		public OutputWriter(Writer writer) {
			this.writer = new PrintWriter(writer);
		}
 
		public void print(Object...objects) {
			for (int i = 0; i < objects.length; i++) {
				if (i != 0)
					writer.print(' ');
				writer.print(objects[i]);
			}
		}
 
		public void printLine(Object...objects) {
			print(objects);
			writer.println();
		}
 
		public void close() {
			writer.close();
		}
 
		public void flush() {
			writer.flush();
		}
 
		}
    static int gcd(int a, int b) 
    { 
        if (a == 0) 
            return b; 
        return gcd(b % a, a); 
    } 
    static int mod = (int)(1e9+7);
    public static long pow(long a,long b)
    {
        long ans = 1;
        while(b> 0)
        {
            if((b & 1)==1){
                ans = (ans*a) % mod; 
            }
            a = (a*a) % mod;
            b = b>>1;
        }
        return ans;
    }
    static void sort(int[] a) {
		ArrayList<Integer> l=new ArrayList<>();
		for (int i:a) l.add(i);
		Collections.sort(l);
		for (int i=0; i<a.length; i++) a[i]=l.get(i);
	}
    public static void main(String[] args) {
        InputReader in = new InputReader(System.in);
        OutputWriter out = new OutputWriter(System.out);
        int t = in.nextInt();
        while(t-- >0)
        {
            int n = in.nextInt();
            char[][] grid = new char[n][n];
            for(int i=0;i<n;i++)
                grid[i] = in.nextLine().toCharArray();
            char x = grid[0][1],y = grid[1][0];
            char u = grid[n-1][n-2],v = grid[n-2][n-1];
            if(x=='0' && y=='0')
            {
                if(u=='0' && v=='0')
                {
                    out.printLine(2);
                    out.printLine((n) + " " + (n));
                    out.printLine((n-1) + " " + (n));
                }
                else if(u=='0' && v=='1')
                {
                    out.printLine(1);
                    out.printLine((n) + " " + (n-1));
                }
                else if(u=='1' && v=='0')
                {
                    out.printLine(1);
                    out.printLine((n-1) + " " + (n));
                }
                else {
                    out.printLine(0);
                }
            }
            else if(x=='0' && y=='1')
            {
                if(u=='0' && v=='0')
                {
                    out.printLine(1);
                    out.printLine(1 + " " + 2);
                }
                else if(u=='0' && v=='1')
                {
                    out.printLine(2);
                    out.printLine((n) + " " + (n-1));
                    out.printLine(2 + " " + 1 );
                }
                else if(u=='1' && v=='0')
                {
                    out.printLine(2);
                    out.printLine((n-1) + " " + (n));
                    out.printLine(2 + " " + 1 );
                }
                else {
                    out.printLine(1);
                    out.printLine(2 + " " + 1 );
                }
            }
            else if(x=='1' && y=='0')
            {
                if(u=='0' && v=='0')
                {
                    out.printLine(1);
                    out.printLine(2 + " " + 1);
                }
                else if(u=='0' && v=='1')
                {
                    out.printLine(2);
                    out.printLine((n) + " " + (n-1));
                    out.printLine(1 + " " + 2 );
                }
                else if(u=='1' && v=='0')
                {
                    out.printLine(2);
                    out.printLine((n-1) + " " + (n));
                    out.printLine(1 + " " + 2 );
                }
                else {
                    out.printLine(1);
                    out.printLine(1 + " " + 2 );
                }
            }
            else{
                if(u=='0' && v=='0')
                {
                    out.printLine(0);
                }
                else if(u=='0' && v=='1')
                {
                    out.printLine(1);
                    out.printLine((n-1) + " " + (n));
                }
                else if(u=='1' && v=='0')
                {
                    out.printLine(1);
                    out.printLine((n) + " " + (n-1));
                    // out.printLine(1 + " " + 2 );
                }
                else {
                    out.printLine(2);
                    out.printLine((n-1) + " " + (n));
                    out.printLine((n) + " " + (n-1));
                }
            }
        }
        out.flush();
        out.close();
    }
}