def solve():
    n = int(input())
    deg = [0] * n
    for _ in range(n - 1):
        a, b = map(int, input().split())
        deg[a - 1] += 1
        deg[b - 1] += 1

    leaf = deg.count(1)
    if leaf * 2 >= n:
        print("Yes")
    else:
        print("No")


for _ in range(int(input())):
    solve()