#include<bits/stdc++.h>
using namespace std;
struct node{
	string a,b,c,d;
}a[10005];
bool cmp (node t,node t1,node t2,node t3,node t4,node t5){
	
}
int main(){
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i].a>>a[i].b>>a[i].c>>a[i].d;
	}
	long long cnt=0;
	for(int t=1;t<=n-5;t++){
	for(int t1=2;t1<=n-4;t1++){
		for(int t2=3;t2<=n-3;t2++){
		for(int t3=4;t3<=n-2;t3++){
		for(int t4=5;t4<=n-1;t4++){
		for(int t5=6;t5<=n;t5++){
		if(cmp(a[t],a[t1],a[t2],a[t3],a[t4],a[t5])) cnt++;
	}
	}
	}
}
	}
	}
	cout<<cnt;
	return 0;
}