#include #include using namespace std; string valid(int data[][2]) { int valid_data[][2] = { {5, 8}, {4, 8}, {6, 8} }; for(int i = 0; i < 3; i++) { if(data[i][0] != valid_data[i][0] || data[i][1] != valid_data[i][1]) { return "No"; } } return "Yes"; } int main() { int data[][2] = { {2, 8}, {3, 9}, {7, 9} }; int n; cin >> n; for(int i = 0; i < n; i++) { int x1, y1, x2, y2; cin >> x1 >> y1 >> x2 >> y2; for(int j = 0; j < 3; j++) { if(data[j][0] == x1 && data[j][1] == y1) { data[j][0] = x2; data[j][1] = y2; } } } cout << valid(data) << endl; return 0; }