import sys
input = sys.stdin.buffer.readline
read = sys.stdin.buffer.read

T = int(input())
for _ in range(T):
    N = int(input())
    deg = [0] * N
    for _ in range(N - 1):
        u, v = map(int, input().split())
        u -= 1; v -= 1
        deg[u] += 1
        deg[v] += 1
    print("Yes" if deg.count(1) * 2 >= N else "No")