t = int(input())
for _ in range(t):
    n = int(input())
    deg = [0 for i in range(n + 1)]
    for i in range(n - 1):
        a, b = map(int, input().split())
        deg[a] += 1
        deg[b] += 1
    print("Yes" if deg.count(1) * 2 >= n else "No")