#include <bits/stdc++.h>

using namespace std;
using ll = long long;
int main() {
  int N;
  cin >> N;
  vector<string> S(N);
  for (auto &s : S)
    cin >> s;
  set<string> st;
  for (int i = 0; i < N; i++)
    for (int j = i + 1; j < N; j++)
      st.insert(S[i] + S[j]), st.insert(S[j] + S[i]);
  cout << st.size() << endl;
}