for _ in range(int(input())):
    n=int(input())
    mat=[]
    for i in range(n):
        temp=input()
        mat.append(temp)
    if mat[0][1]==mat[1][0] and mat[n-1][n-2]==mat[n-2][n-1] and mat[n-1][n-2]!=mat[0][1]:
        print(0)
    elif mat[0][1]==mat[1][0] and mat[n-1][n-2]==mat[n-2][n-1] and mat[n-1][n-2]!=mat[0][1]:
        print(2)
        print(1,2)
        print(2,1)
    elif mat[0][1]==mat[1][0] and mat[n-1][n-2]!=mat[n-2][n-1]:
        if mat[n-1][n-2]==mat[0][1]:
            print(1)
            print(n,n-1)
        else:
            print(1)
            print(n-1,n)
    elif mat[0][1]!=mat[1][0] and mat[n-1][n-2]==mat[n-2][n-1]:
        if mat[0][1]==mat[n-1][n-2]:
            print(1)
            print(1,2)
        else:
            print(1)
            print(2,1)
    else:
        if mat[0][1]==mat[n-1][n-2]:
            print(2)
            print(1,2)
            print(n-1,n)
        else:
            print(2)
            print(2,1)
            print(n-1,n)