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

string cy[10010][14],fz[100000000][14][14],z[140010];

int main(){
	int n;
	cin>>n;
	
	for(int i=1;i<=n;i++){
		for(int j=1;j<=4;j++){
			cin>>cy[i][j];
		}
	}
	
	int lz=0;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=4;j++){
			bool f=0;
			for(int k=1;z[k]!="";k++){
				if(z[k]==cy[i][j]){
					f=1;
					break;
				}
			}
			if(f){
				z[++lz]=cy[i][j];
			}
		}
	}
	
	for(int i=1;i<=4;i++){
		for(int j=1;j<=4;j++){
			for(int k=1;k<=lz;k++){
				
			}
		}
	}
	return 0;
}





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