def solve(n, a):
    if a[0] != a[-1]:
        return 1
    x = a[0]
    for i in range(n):
        a[i] ^= x
    for i in range(n - 1):
        if a[i] == a[i+1] == 1:
            return 1
    return a.count(1) >= 4

for _ in range(int(input())):
    n = int(input())
    a = list(map(int, input().split()))
    res = solve(n, a)
    print('Yes' if res else 'No')