#include <bits/stdc++.h>
using namespace std;
#define ll long long
const ll N = 5e4 + 5;
const ll M = 36;
const ll K = 16;
ll all;
int n, d, z[5];
ll ans[5], ansp[5];
int cn[K][M][M][M][M];
unordered_map <char, short int> f;
string a[N];
int main (){
f['0'] = 0; f['1'] = 1; f['2'] = 2; f['3'] = 3; f['4'] = 4; f['5'] = 5; f['6'] = 6; f['7'] = 7;
f['8'] = 8; f['9'] = 9; f['a'] = 10; f['b'] = 11; f['c'] = 12; f['d'] = 13; f['e'] = 14; f['f'] = 15;
f['g'] = 16; f['h'] = 17; f['i'] = 18; f['j'] = 19; f['k'] = 20; f['l'] = 21; f['m'] = 22; f['n'] = 23;
f['o'] = 24; f['p'] = 25; f['q'] = 26; f['r'] = 27; f['s'] = 28; f['t'] = 29; f['u'] = 30; f['v'] = 31;
f['w'] = 32; f['x'] = 33; f['y'] = 34; f['z'] = 35;
cin >> n >> d;
all = 1ll * n * (n - 1) / 2ll;
for (int i = 0; i < n; i++){
cin >> a[i];
ansp[1] = ansp[2] = ansp[3] = ansp[4] = 0;
for (int msk = 0; msk < 16; msk++){
z[0] = z[1] = z[2] = z[3] = 0;
for (int j = 0; j < 4; j++){
if ((msk >> j) & 1){
z[j] = f[a[i][j]];
}
}
ansp[__builtin_popcount(msk)] += cn[msk][z[0]][z[1]][z[2]][z[3]];
cn[msk][z[0]][z[1]][z[2]][z[3]] ++;
}
ans[4] += ansp[4];
ans[3] += ansp[3] - ansp[4];
ans[2] += ansp[2] - ansp[3] + ansp[4];
ans[1] += ansp[1] - ansp[2] + ansp[3] - ansp[4];
ans[0] += ansp[0] - ansp[1] - ansp[2] + ansp[3] - ansp[4];
}
cout << ans[4 - d] << '\n';
return 0;
}
