#!/usr/bin/env python
import os
import sys
from io import BytesIO, IOBase
#from bisect import bisect_left as bl                #c++ lowerbound bl(array,element)
#from bisect import bisect_right as br               #c++ upperbound br(array,element)
 
 
def main():
    for _ in range(int(input())):
        n=int(input())
        a=[list(input()) for x in range(n)]
        tl=int(a[1][0])
        td=int(a[0][1])
        ru=int(a[n-2][n-1])
        rr=int(a[n-1][n-2])
        ans=[]
        if tl!=td and ru!=rr:
            if tl==ru:
                print(2)
                print(2,1)
                print(n,n-1)
            elif tl==rr:
                print(2)
                print(1,2)
                print(n,n-1)
        elif tl==td==ru==rr:
            print(2)
            print(2,1)
            print(1,2)
        elif (tl==td==0 and ru==rr==1) or (tl==td==1 and ru==rr==0):
            print(0)
        elif (tl==td or ru==rr):
            print(1)
            if tl==td:
                if tl==rr:
                    print(n,n-1)
                else:
                    print(n-1,n)
            elif ru==rr:
                if rr==tl:
                    print(2,1)
                else:
                    print(1,2)
        else:
            print(2)
            print(2,1)
            print(1,2)
            



        


        
        
        
            
            

#-----------------------------BOSS-------------------------------------!
# region fastio

BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")

# endregion

if __name__ == "__main__":
    main()