#!/bin/python3

import math
import os
import random
import re
import sys

# Complete the solve function below.
def solve(board):
    
    if len(board) == 1:
        return "Yes"
    
    temp = board[0]
    sum = 0
    for i in board[1:]:
        sum = int(i,2)^int(temp,2)
    
    if sum <= 0:
        return "No"
    return "Yes"
    
if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    t = int(input().strip())

    for t_itr in range(t):
        n = int(input().strip())

        board = []

        for _ in range(n):
            board.append(''.join(input().rstrip().split()))

        result = solve(board)

        fptr.write(result + '\n')

    fptr.close()