#include <iostream>
#include <set>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	int N, i, j;
	string S[50];
	set<string> Ts;
	cin >> N;
	for (i = 0; i != N; ++i) cin >> S[i];

	for (i = 0; i != N; ++i)
		for (j = i + 1; j != N; ++j)
			Ts.insert(S[i] + S[j]), Ts.insert(S[j] + S[i]);

	cout << Ts.size() << '\n';
	return 0;
}