#include <bits/stdc++.h>
#pragma GCC optimization("Ofast,unroll-loops")
#pragma GCC optimize("O3")
#pragma GCC target("avx2,popcnt")
using namespace std;
//char ch[6][50001];
map<string, int> fr[64];
int bkt(string s, int poz, int mask, string ss){
if(poz == s.size()){
return fr[mask][ss];
}
if(s[poz] == '#') return bkt(s, poz + 1, mask, ss);
if(s[poz] != '?') return bkt(s, poz + 1, mask, ss + s[poz]);
int ans = 0;
for(char ch = 'a'; ch <= 'z'; ch++){
ans += bkt(s, poz + 1, mask, ss + ch);
}
return ans;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int n, m;
long long ans = 0;
cin >> n >> m;
for(int i = 1; i <= n; i++){
string s, ss = "";
cin >> s;
int mask = 0;
for(int j = 0; j < m; j++){
if(s[j] != '?'){
mask ^= (1 << j);
ss += s[j];
}
else if(ss[j] == '?') ss += '#';
}
//cout << "x\n";
for(int mask2 = 0; mask2 < 1 << m; mask2++){
string s2 = "";
for(int j = 0; j < m; j++){
if((mask2 & (1 << j)) && (mask & (1 << j)))
s2 += s[j];
else if(mask2 & (1 << j))
s2 += '?';
else
s2 += '#';
}
//cout << mask2 << " " << s2 << " " << fr[mask2][s2] << '\n';
ans += fr[mask2][s2];
}
for(int mask2 = 0; mask2 < 1 << m; mask2++){
if((mask2 & mask) == mask2){
string s2 = "";
for(int j = 0; j < m; j++){
if(mask2 & (1 << j)){
s2 += s[j];
}
else if(mask & (1 << j))
s2 += '?';
else
s2 += '#';
}
//cout << s << " " << s2 << '\n';
fr[mask][s2]++;
}
}
}
cout << ans << '\n';
return 0;
}
