#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  map<pair<int, int>, char> pos;
  pos[{2, 8}] = 'A';
  pos[{3, 9}] = 'B';
  pos[{7, 9}] = 'C';

  int n; cin >> n;
  REP (i, n) {
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    char target = pos[{a, b}];
    pos[{c, d}] = target;
    pos.erase({a, b});
  }

  if (pos[{5, 8}] = 'A' && pos[{4, 8}] == 'B' && pos[{6, 8}] == 'C')
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  
  return 0;
}