mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.buffer.readline
    
    for _ in range(int(input())):
        N = int(input())
        adj = [[] for _ in range(N+1)]
        for _ in range(N-1):
            a, b = map(int, input().split())
            adj[a].append(b)
            adj[b].append(a)
        
        leaf_num = 0
        for v in range(1, N+1):
            if len(adj[v]) == 1:
                leaf_num += 1
        if leaf_num * 2 >= N:
            print("Yes")
        else:
            print("No")


if __name__ == '__main__':
    main()