from sys import stdin
input=lambda :stdin.readline()[:-1]

def solve():
  n=int(input())
  cnt=[0]*n
  for i in range(n-1):
    a,b=map(lambda x:int(x)-1,input().split())
    cnt[a]+=1
    cnt[b]+=1
  one=cnt.count(1)
  if n-one<=one:
    print('Yes')
  else:
    print('No')

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