import sys

def main():
    input = sys.stdin.read().split()
    ptr = 0
    N = int(input[ptr])
    ptr += 1
    M = int(input[ptr])
    ptr += 1
    bits = []
    for _ in range(M):
        s = input[ptr].strip()
        ptr += 1
        rev_s = s[::-1]
        b = int(rev_s, 2)
        bits.append(b)
    
    for i in range(N):
        for j in range(i + 1, N):
            found = False
            for b in bits:
                if ((b >> i) ^ (b >> j)) & 1:
                    found = True
                    break
            if not found:
                print("No")
                return
    print("Yes")

if __name__ == "__main__":
    main()