#include"bits/stdc++.h"
#include"atcoder/all"
using namespace std;
using namespace atcoder;
#pragma GCC target("avx2")
#pragma GCC optimize("O2")
#pragma GCC optimize("unroll-loops")
using ll = long long;
using ld = long double;
#define rep(i,m,n) for(ll i=(ll)m;i<(ll)n;i++)
#define drep(i,m,n) for(ll i=m-1;i>=n;i--)
#define Endl endl
#define pr(i,j) make_pair(i,j) 
#define isin(x,l,r) (l<=x&&x<r)
#define chmin(a,b) a=min(a,b)
#define chmax(a,b) a=max(a,b)
#define srt(ar) sort(ar.begin(),ar.end())
#define rev(ar) reverse(ar.begin(),ar.end())
#define jge(f) cout<<(f?"Yes":"No")<<endl
const ll inf = 1e18;
const ld pi = 3.14159265358979;
const ld eps = 1e-9;
using mint = modint998244353;
clock_t ST, FN;

int main() {
    ST = clock();
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    map<pair<ll, ll>, string>mp;
    mp[pr(2, 8)] = "A";
    mp[pr(3, 9)] = "B";
    mp[pr(7, 9)] = "C";
    ll n;
    cin >> n;
    rep(i, 0, n) {
        ll a, b, c, d;
        cin >> a >> b >> c >> d;
        mp[pr(c, d)] = mp[pr(a, b)];
        mp[pr(a, b)] = "";
    }
    if (mp[pr(5, 8)] == "A" && mp[pr(4, 8)] == "B" && mp[pr(6, 8)] == "C")cout << "YES" << endl;
    else cout << "NO" << Endl;
}