def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    
    idx = 0
    N = int(data[idx])
    idx += 1
    M = int(data[idx])
    idx += 1
    
    bits_list = []
    for _ in range(M):
        s = data[idx]
        idx += 1
        reversed_s = s[::-1]
        bits = [int(c) for c in reversed_s]
        bits_list.append(bits)
    
    total_pairs = N * (N - 1) // 2
    if total_pairs == 0:
        print("Yes")
        return
    
    for i in range(1, N + 1):
        for j in range(i + 1, N + 1):
            covered = False
            for bits in bits_list:
                if bits[i - 1] != bits[j - 1]:
                    covered = True
                    break
            if not covered:
                print("No")
                return
    
    print("Yes")

if __name__ == "__main__":
    main()