for _ in range(int(input())):
n = int(input())
l = [[*map(int, input().split())] for i in range(n)]
dx = [0,0,1,-1]
dy = [1,-1,0,0]
flag = False
for i in range(n):
for j in range(n):
if l[i][j] == 0:
flag = True
break
for d in range(4):
ny = i + dy[d]
nx = j + dx[d]
if ny < 0 or nx < 0 or ny >= n or nx >= n:
continue
if l[i][j] == l[ny][nx]:
flag = True
break
if flag:
break
print("YES" if flag else "NO")