import sys
input = sys.stdin.readline
sys.setrecursionlimit(2000000)
def read_values(): return tuple(map(int, input().split()))
def read_list(): return list(read_values())

def scc(N, G, RG):
    order = []
    used = [0]*N
    group = [None]*N
    def dfs(s):
        used[s] = 1
        for t in G[s]:
            if not used[t]:
                dfs(t)
        order.append(s)
    def rdfs(s, col):
        group[s] = col
        used[s] = 1
        for t in RG[s]:
            if not used[t]:
                rdfs(t, col)
    for i in range(N):
        if not used[i]:
            dfs(i)
    used = [0]*N
    label = 0
    for s in reversed(order):
        if not used[s]:
            rdfs(s, label)
            label += 1
    return label, group

def main():
    n = int(input())
    g = [list() for _ in range(n)]
    rg = [list() for _ in range(n)]
    for i in range(n):
        a = read_list()
        for j in range(1,a[0]+1):
            g[i].append(a[j]-1)
            rg[a[j]-1].append(i)
    r,res = scc(n,g,rg)
    if res[0]:
        print("No")
        return
    l = [False] * r    
    l[-1] = True
    for i in range(n):
        lab = res[i]
        for v in g[i]:
            l[lab] |= lab + 1 == res[v]
            
    if all(l):
        print("Yes")
    else:
        print("No")
        
if __name__ == "__main__":
    main()