from collections import Counter, defaultdict, deque
import sys
input=sys.stdin.readline
N=int(input())
n=N
#n,m=map(int,input().split())
class SCC:
    def __init__(self,n):
        self.n = n
        self.edges = []
 
    def add_edge(self,a,b):
        self.edges.append((a,b))
 
    def scc(self):
        n = self.n
        counter = [0]*(n+1)
        elist = [0]*len(self.edges)
        for x,y in self.edges:
            counter[x+1] += 1
        for x in range(n):
            counter[x+1] += counter[x]
        start = counter[:]
        for x,y in self.edges:
            elist[counter[x]] = y
            counter[x] += 1
 
        k = 0
        low = [0]*n
        num = [-1]*n
        pre = [None]*n
        visited = []
        q = []
        sccs = []
        for x in range(n):
            if num[x] < 0:
                q.append(x)
                q.append(x)
                while q:
                    x = q.pop()
                    if num[x] < 0:
                        low[x] = num[x] = k
                        k += 1
                        visited.append(x)
                        for i in range(start[x],start[x+1]):
                            y = elist[i]
                            if num[y] < 0:
                                q.append(y)
                                q.append(y)
                                pre[y] = x
                            else:
                                low[x] = min(low[x],num[y])
                    else:
                        if low[x] == num[x]:
                            scc = []
                            while 1:
                                y = visited.pop()
                                num[y] = n
                                scc.append(y)
                                if x == y:
                                    break
                            sccs.append(scc)
                        y = pre[x]
                        if y is not None:
                            low[y] = min(low[y],low[x])
        return sccs[::-1]
scc = SCC(n)
C=[]
for i in range(N):
  A=list(map(int, input().split()))
  B=A[1:]
  for b in B:
    C.append((i,b-1))
    scc.add_edge(i,b-1)
    
ans = scc.scc()

d=len(ans)
D=[-1]*N 
for i in range(len(ans)):
  B=ans[i]
  for b in B:
    D[b]=i 

E=[[] for i in range(d)]
for x,y in C:
  x,y=D[x],D[y]
  if y!=0:
    E[x].append(y)

V=[-1]*d 
from collections import deque
d=deque()
d.append(0)
su=d
while d:
  now=d.popleft()
  V[now]=1 
  if len(E[now])!=0:
    nex=E[now][0]
    d.append(nex)

if len(set(V))==1:
  print('Yes')
else:
  print('No')