#include"bits/stdc++.h"

using namespace std;

const long long N = 1e6 + 10;
const long long mod = 1e9 + 7;

long long n, m, ans = 0;

unordered_map<string, long long> mp;
string ss[200];

string make(string s1, string s2) {
	string s3;
	s3 += " ";
	for(long long i = 1; i <= n; i++) {
		s3 += s1[s2[i] - '0'];
	}
	return s3;
}

void dfs(string s, long long k) {
	if(mp[s]) return;
	ans++;
	ans %= mod;
	mp[s] = 1;
	for(long long i = k + 1; i <= m; i++) {
		dfs(make(s, ss[i]), i);
	}
}

void solve() {
	cin >> n >> m;
	for(long long i = 1; i <= m; i++) {
		ss[i] += " ";
		for(long long j = 1; j <= n; j++) {
			string x;
			cin >> x;
			ss[i] += x;
		}
	}
	for(long long i = 1; i <= m; i++) {
		dfs(ss[i], i);
	}
	cout << ans << "\n";
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	solve();
	return 0;
}