#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
#define F first
#define S second
int main(){
  int n;
  cin>>n;
  P p[n][2];
  map<P,vector<P> > m;
  for(int i=0;i<n;i++){
    cin>>p[i][0].F>>p[i][0].S>>p[i][1].F>>p[i][1].S;
    m[p[i][0]].push_back(P(i,0));
    m[p[i][1]].push_back(P(i,1));
  }
  bool u[n],f=1;
  memset(u,0,sizeof(u));
  for(int i=0;i<n;i++){
    if(u[i]) continue;
    bool ff=0;
    for(int j=0;j<2;j++){
      bool v[n],w[n],fff=1;
      memset(v,0,sizeof(v));
      memset(w,0,sizeof(w));
      w[i]=j;
      queue<int> q;
      q.push(i);
      while(!q.empty()){
	int x=q.front();q.pop();
	if(v[x]) continue;
	v[x]=1;
	for(int k=0;k<(int)m[p[x][w[x]]].size();k++){
	  P np=m[p[x][w[x]]][k];
	  if(np.F==x) continue;
	  if(v[np.F]){
	    if(w[np.F]!=np.S) fff=0;
	  }else{
	    w[np.F]=!np.S;
	  }
	  q.push(np.F);
	}
      }
      for(int k=0;k<n;k++) u[k]|=v[k];
      ff|=fff;
    }
    f&=ff;
    //cout<<i<<" "<<f<<endl;
  }
  cout<<(f?"YES":"NO")<<endl;
  return 0;
}