//include //------------------------------------------ #include <vector> #include <list> #include <map> #include <unordered_map> #include <climits> #include <set> #include <unordered_set> #include <deque> #include <stack> #include <bitset> #include <algorithm> #include <functional> #include <numeric> #include <utility> #include <sstream> #include <iostream> #include <iomanip> #include <cstdio> #include <cmath> #include <cstdlib> #include <cctype> #include <string> #include <cstring> #include <ctime> #include <queue> #include <random> #include <complex> #include <regex> #include <locale> #include <random> #include <type_traits> using namespace std; #define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";} #define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}} using LL = long long; //------------------------------------------ //------------------------------------------ int main() { int N; cin >> N; vector<vector<int>> A(11, vector<int>(11, 0)); A[2][8] = 1; A[3][9] = 2; A[7][9] = 3; for (int i = 0; i < N; i++) { int x1, y1, x2, y2; cin >> x1 >> y1 >> x2 >> y2; swap(A[x1][y1], A[x2][y2]); } if(A[5][8] == 1 && A[4][8] == 2 && A[6][8] == 3){ cout << "YES" << endl; }else{ cout << "NO" << endl; } }