import random
n = int(input())
m = int(input())

# n <= 512
# m <= 65536

r = [int(input(),2) for i in range(m)]
random.shuffle(r)

for i in range(n):
	for j in range(i+1, n):
		mode = 0
		for k in range(m):
			if r[k] >> i & 1 != r[k] >> j & 1:
				mode = 1
				break
		if mode == 0:
			print("No")
			exit()

print("Yes")