import sys

def main():
    data = sys.stdin.read().split()
    ptr = 0
    N = int(data[ptr])
    ptr += 1
    M = int(data[ptr])
    ptr += 1
    masks = []
    for _ in range(M):
        s = data[ptr]
        ptr += 1
        mask = int(s[::-1], 2)
        masks.append(mask)
    
    ok = True
    for i in range(1, N + 1):
        for j in range(i + 1, N + 1):
            a = i - 1
            b = j - 1
            if not any(((m >> a) ^ (m >> b)) & 1 for m in masks):
                ok = False
                break
        if not ok:
            break
    
    print("Yes" if ok else "No")

if __name__ == "__main__":
    main()