def main():
    import sys
    input = sys.stdin.read().split()
    ptr = 0
    N = int(input[ptr])
    ptr += 1
    M = int(input[ptr])
    ptr += 1
    masks = []
    for _ in range(M):
        s = input[ptr]
        ptr += 1
        reversed_s = s[::-1]
        mask = 0
        for k in range(len(reversed_s)):
            if reversed_s[k] == '1':
                mask |= 1 << k
        masks.append(mask)
    
    for i in range(1, N+1):
        for j in range(i+1, N+1):
            found = False
            for mask in masks:
                a = (mask >> (i-1)) & 1
                b = (mask >> (j-1)) & 1
                if a != b:
                    found = True
                    break
            if not found:
                print("No")
                return
    print("Yes")

if __name__ == "__main__":
    main()