# 全部決まっとるやんけ
t = int(input())

def is_shitoshito(arr):
    if len(arr) != 5: return False
    x1, x2, x3, x4, x5 = arr
    if x1 == x3 and x2 == x4 == x5 and x1 != x2: return True
    return False

def solve():
    n = int(input())
    a = list(map(int, input().split()))
    if all(is_shitoshito(a[5*i:5*i+5]) for i in range(n)):
        print("Yes")
    else:
        print("No")
for _ in range(t):
    solve()