using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, m) = (c[0], c[1]);
        var s = new int[m];
        for (var i = 0; i < m; ++i)
        {
            var t = ReadLine();
            var si = 0;
            for (var j = 0; j < t.Length; ++j)
            {
                si <<= 1;
                si += t[j] - '0';
            }
            s[i] = si;
        }
        WriteLine(Judge(n, m, s) ? "Yes" : "No");
    }
    static bool Judge(int n, int m, int[] s)
    {
        var uf = new UnionFindTree(n);
        var isall1 = Enumerable.Repeat(true, n).ToArray();
        for (var l = 0; l < n; ++l)
        {
            for (var i = 0; i < m; ++i)
            {
                if (((s[i] >> l) & 1) == 0)
                {
                    isall1[l] = false;
                    break;
                }
            }
            for (var r = l + 1; r < n; ++r)
            {
                var flg = true;
                for (var i = 0; i < m; ++i)
                {
                    if (((s[i] >> l) & 1) != ((s[i] >> r) & 1))
                    {
                        flg = false;
                        break;
                    }
                }
                if (flg) uf.Unite(l, r);
            }
        }
        var set = new HashSet<int>(s);
        var bitmax = 1 << n;
        for (var b = 0; b < bitmax; ++b)
        {
            var flg = true;
            for (var l = 0; l < n; ++l) for (var r = l + 1; r < n; ++r)
            {
                if (!flg) break;
                if (uf.IsSameTree(l, r) && ((b >> l) & 1) != ((b >> r) & 1)) flg = false;
            }
            for (var l = 0; l < n; ++l)
            {
                if (!flg) break;
                if (isall1[l] && ((b >> l) & 1) == 0) flg = false;
            }
            if (flg && !set.Contains(b)) return false;
        }
        return true;
    }
    class UnionFindTree
    {
        int[] roots;
        public UnionFindTree(int size)
        {
            roots = new int[size];
            for (var i = 0; i < size; ++i) roots[i] = -1;
        }
        public int GetRoot(int a)
        {
            if (roots[a] < 0) return a;
            return roots[a] = GetRoot(roots[a]);
        }
        public bool IsSameTree(int a, int b)
        {
            return GetRoot(a) == GetRoot(b);
        }
        public bool Unite(int a, int b)
        {
            var x = GetRoot(a);
            var y = GetRoot(b);
            if (x == y) return false;
            if (-roots[x] < -roots[y]) { var tmp = x; x = y; y = tmp; }
            roots[x] += roots[y];
            roots[y] = x;
            return true;
        }
        public int GetSize(int a)
        {
            return -roots[GetRoot(a)];
        }
    }
}