import java.util.*;import java.lang.*;import java.io.*;import java.math.*;import java.text.*;
public class Main
{
    static private int MAX=100005;static private long mod=(long)1e9+7;//(long)998244353;//1e9+7;
    static private int IMX=Integer.MAX_VALUE,IMN=Integer.MIN_VALUE;static private long LMX=Long.MAX_VALUE,LMN=Long.MIN_VALUE;static Reader sc;static PrintWriter out;

    public static void main (String[] args) throws java.lang.Exception
    {
       Scanner scc=new Scanner(System.in);out=new PrintWriter(System.out);
       //sc=new Reader();out=new PrintWriter(System.out);
        
        int t=scc.nextInt();
        int k=0;
        while(t-->0)
        {
            int n=scc.nextInt();
            String arr[]=new String[n];
            for(int i=0;i<n;i++)
            {
            	arr[i]=scc.next();
            }
          	char a=arr[0].charAt(1);
            char b=arr[1].charAt(0);
            char x=arr[n-1].charAt(n-2);
            char y=arr[n-2].charAt(n-1);
            int x1=0,y1=0,x2=0,y2=0;
            int count=0;
            if(a==b && x==y && a!=x)
            {
            	out.println(0);
            }
            else if(a==b && x==y && a==x)
            {
            	out.println(2);
            	out.println(1+" "+2);
            	out.println(2+" "+1);
            }
            else if(a!=b && x==y)
            {
            	out.println(1);
            	if(x=='1')
            	{
            		if(a=='1')
            			out.println(1+" "+2);
            		else
            			out.println(2+" "+1);
            	}
            	else
            	{
            		if(a=='0')
            			out.println(1+" "+2);
            		else
            			out.println(2+" "+1);
            	}
            }
    		else if(a==b && x!=y)
            {
            	out.println(1);
            	if(a=='1')
            	{
            		if(x=='1')
            			out.println(n+" "+(n-1));
            		else
            			out.println((n-1)+" "+n);
            	}
            	else
            	{
            		if(x=='0')
            			out.println(n+" "+(n-1));
            		else
            			out.println((n-1)+" "+n);
            	}
            }
            else if(a!=b && x!=y)
            {
            	if(a=='1')
            		out.println(1+" "+2);
            	else
            		out.println(2+" "+1);
            	if(x=='0')
            		out.println(n+" "+(n-1));
            	else
            		out.println(n-1+" "+n);
            }
           
        }
        out.flush();
    }

            
         
    







    static class Reader 
    { 
        final private int BUFFER_SIZE = 1 << 16; 
        private DataInputStream din; 
        private byte[] buffer; 
        private int bufferPointer, bytesRead; 
  
        public Reader() 
        { 
            din = new DataInputStream(System.in); 
            buffer = new byte[BUFFER_SIZE]; 
            bufferPointer = bytesRead = 0; 
        } 
  
        public Reader(String file_name) throws IOException 
        { 
            din = new DataInputStream(new FileInputStream(file_name)); 
            buffer = new byte[BUFFER_SIZE]; 
            bufferPointer = bytesRead = 0; 
        } 
  
        public String nextLine() throws IOException 
        { 
            byte[] buf = new byte[64]; // line length 
            int cnt = 0, c; 
            while ((c = read()) != -1) 
            { 
                if (c == '\n') 
                    break; 
                buf[cnt++] = (byte) c; 
            } 
            return new String(buf, 0, cnt); 
        } 
  
        public int nextInt() throws IOException 
        { 
            int ret = 0; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
            do
            { 
                ret = ret * 10 + c - '0'; 
            }  while ((c = read()) >= '0' && c <= '9'); 
  
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        public long nextLong() throws IOException 
        { 
            long ret = 0; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
            do { 
                ret = ret * 10 + c - '0'; 
            } 
            while ((c = read()) >= '0' && c <= '9'); 
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        public double nextDouble() throws IOException 
        { 
            double ret = 0, div = 1; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
  
            do { 
                ret = ret * 10 + c - '0'; 
            } 
            while ((c = read()) >= '0' && c <= '9'); 
  
            if (c == '.') 
            { 
                while ((c = read()) >= '0' && c <= '9') 
                { 
                    ret += (c - '0') / (div *= 10); 
                } 
            } 
  
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        private void fillBuffer() throws IOException 
        { 
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE); 
            if (bytesRead == -1) 
                buffer[0] = -1; 
        } 
  
        private byte read() throws IOException 
        { 
            if (bufferPointer == bytesRead) 
                fillBuffer(); 
            return buffer[bufferPointer++]; 
        } 
  
        public void close() throws IOException 
        { 
            if (din == null) 
                return; 
            din.close(); 
        } 

    }   

    class pair<T,G>
    {
        T x; G y;
        public pair(){}
        public pair(T x,G y)
        {this.x=x;this.y=y;}
        public String toString()
        {return " <"+x.toString()+","+y.toString()+"> ";}
    }
}