for test in range(input()):
    n = input()
    l = []
    for _ in range(n):
        l.append(raw_input())
    if l[0][1]=='0' and l[1][0]=='0':
        if l[n-1][n-2]=='0' and l[n-2][n-1]=='0':
            print 2
            print 1,2
            print 2,1
        if l[n-1][n-2]=='0' and l[n-2][n-1]=='1':
            print 1
            print n,n-1
        if l[n-1][n-2]=='1' and l[n-2][n-1]=='0':
            print 1
            print n-1,n
        if l[n-1][n-2]=='1' and l[n-2][n-1]=='1':
            print 0
    if l[0][1]=='0' and l[1][0]=='1':
        if l[n-1][n-2]=='0' and l[n-2][n-1]=='0':
            print 1
            print 1,2
        if l[n-1][n-2]=='0' and l[n-2][n-1]=='1':
            print 2
            print 2,1
            print n,n-1
        if l[n-1][n-2]=='1' and l[n-2][n-1]=='0':
            print 2
            print 2,1
            print n-1,n
        if l[n-1][n-2]=='1' and l[n-2][n-1]=='1':
            print 1
            print 2,1
    if l[0][1]=='1' and l[1][0]=='0':
        if l[n-1][n-2]=='0' and l[n-2][n-1]=='0':
            print 1
            print 2,1
        if l[n-1][n-2]=='0' and l[n-2][n-1]=='1':
            print 2
            print 1,2
            print n,n-1
        if l[n-1][n-2]=='1' and l[n-2][n-1]=='0':
            print 2
            print 2,1
            print n,n-1
        if l[n-1][n-2]=='1' and l[n-2][n-1]=='1':
            print 1
            print 1,2
    if l[0][1]=='1' and l[1][0]=='1':
        if l[n-1][n-2]=='0' and l[n-2][n-1]=='0':
            print 0
        if l[n-1][n-2]=='0' and l[n-2][n-1]=='1':
            print 1
            print n-1,n
        if l[n-1][n-2]=='1' and l[n-2][n-1]=='0':
            print 1
            print n,n-1
        if l[n-1][n-2]=='1' and l[n-2][n-1]=='1':
            print 2
            print 1,2
            print 2,1
            
            
