for _ in range(int(input())):
    n = int(input())
    A = list(map(int, input().split()))
    ans = 1
    for i in range(0, 5*n, 5):
        if A[i] == A[i+2] and A[i+1] == A[i+3] == A[i+4] and A[i] != A[i+1]:
            pass
        else:
            ans = 0
    print("Yes" if ans else "No")