#include <bits/stdc++.h>
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
void setIO() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
}
int32_t main() {
setIO();
int n;
cin >> n;
unordered_map<string, int> occ, imp_occ;
set<string> imp;
for(int i=0; i<n; i++) {
string str;
cin >> str;
set<string> s;
imp.insert(str);
imp_occ[str]++;
for(int j=0; j<sz(str); j++) {
string curr = "";
for(int k=j; k<sz(str); k++) {
curr += str[k];
s.insert(curr);
}
}
for(const string &x : s)
occ[x]++;
}
ll ans = 0;
for(auto &x : occ) {
if(imp.count(x.first))
ans += (x.second - 1) * imp_occ[x.first];
}
cout << ans << '\n';
return 0;
}
