def main():
    for i in range(int(input())):
        n=int(input())
        matx=[]
        for i in range(n):
            x=list(input())
            matx.append(x)
        x=matx[n-2][n-1]
        y = matx[n-1][n-2]
        a=matx[0][1]
        b=matx[1][0]
        p=a+b
        q=x+y
        if  x==y and a==b and x!=a:
            print(0)
        elif (p=='00' and q=='00') or (p=='11' and q=='11'):
            print(2)
            print(1,2)
            print(2,1)
        elif (p == '10' and q == '10') or (p == '01' and q == '01'):
            print(2)
            print(1,2)
            print(n,n-1)
        elif (p == '01' and q == '10') or (p == '10' and q == '01'):
            print(2)
            print(1,2)
            print(n-1,n)
        elif (p=='01' or p=='10') and q=='11':
            print(1)
            print(2,1)
        elif (p == '01' or p == '10') and q == '00':
            print(1)
            print(1,2)
        elif (p == '00' or p == '11') and q == '10':
            print(1)
            print(n,n-1)
        elif (p=='00' or p=='11') and q=='01':
            print(1)
            print(n-1, n)



if __name__ == "__main__":
    main()