I,R,P=input,range,print
N,M=map(int,I().split())
S=[int(I(),2)for m in R(M)]
p=1<<N
O=[0]*p
for s in S:O[s]=1
if O[0]*O[p-1]<1:P("No"),exit()
for m in R(1,M):
	for n in R(m):
		if O[S[m]&S[n]]*O[S[m]|S[n]]<1:P("No"),exit()
P("Yes")