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

int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);

	int n;
	cin >> n;
	vector<pair<string, string>>v;

	for (int i = 0; i < n; i++)
	{
		string s, t;
		cin >> s >> t;
		v.push_back({s, t});
	}

	auto check =[&](pair<string, string> a, pair<string, string>b,  pair<string, string> c)
	{	
		string aa, bb, cc;
		for (int i = 0; i < 2; i++) {
			for (int j = 0; j < 2; j++) {
				for (int k = 0; k < 2; k++) {
					if(i) 
					 	aa = a.first;
					 else
					 	aa = a.second;
					 if(j) 
					 	bb = a.first;
					 else
					 	bb = a.second;
					 if(k) 
					 	cc = a.first;
					 else
					 	cc = a.second;	

					 for (int i = 0; i < 4; i++)
					 {
					 	if( (aa[i] == bb[i] && bb[i] == cc[i]) || (aa[i] != bb[i] && aa[i] != cc[i] && bb[i] != cc[i]) )
					 		return 1;
					 }
				}
			}
		}

		return 0;
	};

	int ans = 0;
	for (int a = 0; a < n; a++) {
		for (int b = a + 1; b < n; b++) {
			for (int c = b + 1; c < n; c++) {
				if(check(v[a], v[b], v[c]))
					ans++;
			}
		}
	}

	cout << ans << "\n";

	return 0;
}