n = int(input())
m = int(input())
lis = [[0] * 4 for _ in [0] * m]
for i in range(m):
	s = input()
	for j in range(n):
		p = j >> 6
		q = j & 63
		lis[i][p] |= int(s[j]) << q

MAX_INT = (1 << 64) - 1
for i in range(n):
	a = [MAX_INT] * 4
	b = [0] * 4
	p = i >> 6
	q = i & 63
	for j in range(m):
		if((lis[j][p] >> q) & 1):
			for k in range(4):
				a[k] &= lis[j][k]
		else:
			for k in range(4):
				b[k] |= lis[j][k]
	for j in range(n):
		p = j >> 6
		q = j & 63
		if(i != j and (a[p] >> q) & 1 and ((b[p] >> q) & 1) == 0):
			print("No")
			exit(0)
print("Yes")