This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int B1 = 77777;
const int B2 = 12345;
const int md1 = 1e9 + 7;
const int md2 = 1e9 + 9;
int add(int a, int b, int md) {
return a + b < md ? a + b : a + b - md;
}
void ckadd(int& a, int b, int md) {
a = add(a, b, md);
}
int mul(int a, int b, int md) {
return a * 1LL * b % md;
}
void ckmul(int& a, int b, int md) {
a = mul(a, b, md);
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n, k;
cin >> n >> k;
map<string, int> mp;
vector<vector<int>> dp(n + 1, vector<int>(k));
for (int i = 1; i <= n; i++) {
vector<string> s(k);
for (int j = 0; j < k; j++) {
cin >> s[j];
if (i == 1) {
dp[i][j] = 1;
}
}
for (int j = 0; j < k; j++) {
vector<string> prv;
{
string t = "";
for (int p = 0; p + 1 < i; p++) {
t += s[j][p];
}
prv.push_back(t);
}
{
string t = "";
for (int p = 1; p < i; p++) {
t += s[j][p];
}
prv.push_back(t);
}
if ((int) prv.size() >= 2 && prv[0] == prv[1]) {
prv.pop_back();
}
for (string t : prv) {
ckadd(dp[i][j], mp[t], md1);
}
}
mp.clear();
for (int j = 0; j < k; j++) {
ckadd(mp[s[j]], dp[i][j], md1);
}
}
int res = 0;
for (int i = 0; i < k; i++) {
ckadd(res, dp[n][i], md1);
}
cout << res << '\n';
return 0;
}
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