#include <bits/stdc++.h>

using namespace std;

void fast_io() {
	ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
}
#include <atcoder/dsu>
using namespace atcoder;
int main() {
	fast_io();
	int m;
	cin >> m;
	vector<tuple<int, int, int>> abc;
	map<pair<int, int>, vector<int>> mp;
	for (int i = 0; i < m; i++) {
		int a, b, c;
		cin >> a >> b >> c;
		abc.emplace_back(a, b, c);
		mp[{a, b}].push_back(i);
		mp[{b, c}].push_back(i);
		mp[{a, c}].push_back(i);
	}
	dsu uf(2 * m);
	for (auto [k, v] : mp) {
		if (v.size() > 2) {
			cout << "NO\n";
			return 0;
		}
		auto [a, b] = k;
		if (v.size() == 2) {
			bool rev[2];
			for (int i = 0; i < 2; i++) {
				auto [x, y, z] = abc[v[i]];
				rev[i] = x == a && z == b;
			}
			if (rev[0] == rev[1]) {
				uf.merge(v[0], v[1] + m);
				uf.merge(v[0] + m, v[1]);
			} else {
				uf.merge(v[0], v[1]);
				uf.merge(v[0] + m, v[1] + m);
			}
		}
	}
	for (int i = 0; i < m; i++) {
		if (uf.same(i, i + m)) {
			cout << "NO\n";
			return 0;
		}
	}
	cout << "YES\n";
}