#include<bits/stdc++.h>
using namespace std;

int main() {
    int v, d;
    cin >> v >> d;
    d = min(d, v+998); // offset less than 998 fails to get AC (nande???)
    using bs = bitset<1000>;
    vector<bs> E(v);
    for (auto& i : E) {
        string str;
        cin >> str;
        reverse(str.begin(), str.end());
        i = bs(str);
    }
    const int pwrdp = 11; // 2^11 > V + 998 > 2^10
    vector<vector<bs>> dp(pwrdp, vector<bs>(v));
    dp[0] = E;
    // log D
    for (int i = 1; i < pwrdp; ++i) {
        // V
        for (int j = 0; j < v;++j){
            // min(V, D)
            for (int k = dp[i - 1][j]._Find_first(); k < v; k = dp[i - 1][j]._Find_next(k)) {
                dp[i][j] |= dp[i - 1][k];
            }
        }
    }

    vector<bs> Rchbl(v), x, emp(v);
    for (int i = 0; i < v; ++i) Rchbl[i].set(i);
    // log D
    for (int di = 0, dd = d; dd > 0; ++di, dd /= 2) {
        if (dd & 1) {
            x = emp;
            // V
            for (int i = 0; i < v; ++i) {
                // min(V, D)
                for (int j = Rchbl[i]._Find_first(); j < v; j = Rchbl[i]._Find_next(j)) {
                    // V/w
                    x[i] |= dp[di][j];
                }
            }
            Rchbl = x;
        }
    }
    // V
    for (int i = 0; i < v; ++i)
        if (Rchbl[i].count() < v) return cout << "No" << endl, 0;
    cout << "Yes" << endl;
}