#include <bits/stdc++.h>

#define rep(i,l,r) for (int i = l; i <= r; i++)
#define per(i,r,l) for (int i = r; i >= l; i--)
#define fi first
#define se second
#define pb push_back
#define mp std::make_pair
#define gin std::cin
#define prt std::cout
#define edl std::endl

namespace Main {
  const int mod = 1e9 + 7;
  int n,d,a[200005],f[200005],b[1 << 16];
  void add(int &x,int v) {
    x += v; x %= mod;
  }
  void main() {
    scanf("%d%d",&n,&d);
    rep(i,1,n) {
      per(j,d - 1,0) {
        int v;
        scanf("%1d",&v);
        a[i] += (v << j);
      }
    }
    int ans = 0;
    rep(i,1,n) {
      add(f[i],1);
      int high = ((a[i] >> 8) << 8),low = (a[i] & ((1 << 8) - 1));
      rep(j,0,(1 << 8) - 1) {
        if (((j << 8) & high) == (j << 8)) add(f[i],b[(j << 8) + low]);
      }
      add(ans,f[i]);
      rep(j,0,(1 << 8) - 1) {
        if ((j & low) == low) add(b[high + j],f[i]);
      }
    }
    prt << ans;
  }
} signed main() { Main::main(); return 0; }