#include "bits/stdc++.h"
using namespace std;

#define REP(i, n) for(ll i = 0;i < n;i++)
#define REPR(i, n) for(ll i = n;i >= 0;i--)
#define FOR(i, m, n) for(ll i = m;i < n;i++)
#define FORR(i, m, n) for(ll i = m;i >= n;i--)
#define REPO(i, n) for(ll i = 1;i <= n;i++)
#define ll long long
#define INF (ll)1ll << 60
#define MINF (-1 * INF)
#define ALL(n) n.begin(),n.end()
#define MOD (ll)1000000007
#define P pair<ll, ll>

set<string> st;
int main(){
    int n;
    cin >> n;
    vector<string> s(n);
    REP(i, n)cin >> s[i];
    REP(i, n){
        FOR(j, i + 1, n){
            st.insert(s[i] + s[j]);
            st.insert(s[j] + s[i]);
        }
    }
    cout << st.size() << endl;
}