n = int(input())
assert 0 <= n <= 10
t = []
m = int(input())
assert 0 <= m <= 10
for _ in range(m):
    k = int(input())
    assert k > 0
    a = list(map(int, input().split()))
    assert k == len(a)
    for i in range(1, k):
        assert a[i - 1] < a[i]
    assert a[0] >= 0
    assert a[-1] < n
    t.append(a)
ans = False
for i in range(n):
    for j in range(i):
        ch = True
        for k in t:
            c = 0
            for x in k:
                if x in [i, j]:
                    c += 1
            ch &= c != 1
        ans |= ch
print("YNeos"[ans::2])