#include<bits/stdc++.h>
using namespace std;
using Int=long long;
using Real=long double;
template<class T,class S>inline bool chmin(T&A,S B){if(A>B){A=B;return true;}else{return false;}}
template<class T,class S>inline bool chmax(T&A,S B){if(A<B){A=B;return true;}else{return false;}}
#define REP(i,n)for(int i=0;i<(n);++i)
#define REP1(i,n)for(int i=1;i<=(n);++i)
#define ALL(x)begin(x),end(x)
#define drop(x){cout<<(x)<<'\n';return;}
int N;
pair<int,int>A[3];
void sol()
{
	cin>>N;
	A[0]={2,8};
	A[1]={3,9};
	A[2]={7,9};
	REP(i,N)
	{
		int a,b,c,d;cin>>a>>b>>c>>d;
		REP(j,3)if(A[j]==pair{a,b})A[j]={c,d};
	}
	cout<<(A[0]==pair{5,8}&&A[1]==pair{4,8}&&A[2]==pair{6,8}?"YES":"NO")<<"\n";
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
	cout<<fixed<<setprecision(16);
	int T=1;
	//cin>>T;
	while(T--)sol();
}