// XD XD
#include <bits/stdc++.h>
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define el cout << "\n";
using namespace std;
using ll = long long;
const int MAXN = 1e6 + 7;
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const ll LLINF = 1e18 + 7;
template <typename T>
bool ckmin(T& a, T b) {
return a > b ? a = b, true : false;
}
template <typename T>
bool ckmax(T& a, T b) {
return a < b ? a = b, true : false;
}
ll get(string s) {
ll res = 0;
for (char x : s) {
res *= 36;
if (isdigit(x)) {
res += x - '0';
} else {
res += x - 'a' + 10;
}
}
return res;
}
int n, d;
string s[MAXN];
ll calc(int mask) {
map<ll, int> mp;
ll res = 0;
for (int i = 0; i < n; i++) {
string sub = "";
for (int j = 0; j < 4; j++) {
if (mask >> j & 1) {
sub += s[i][j];
}
}
ll val = get(sub);
res += mp[val]++;
}
return res;
}
void solve(int id) {
// cout << "Case " << id << ": ";
cin >> n >> d;
d = 4 - d;
for (int i = 0; i < n; i++) {
cin >> s[i];
}
ll ans = 0;
for (int mask = 0; mask < (1 << 4); mask++) {
int cm = __builtin_popcount(mask);
if (cm == d) {
ans += calc(mask);
}
if (cm == d + 1) {
ans -= calc(mask);
}
}
cout << ans << "\n";
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int T = 1;
// cin >> T;
for (int i = 1; i <= T; i++) {
solve(i);
}
return 0;
}
