#include <bits/stdc++.h>
using namespace std;
void Yes(){cout << "YES\n";}
void No(){cout << "NO\n";}

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

    int N; cin >> N;
    vector<tuple<int,int,int>> ABC(N);
    map<pair<int,int>,vector<int>> M;
    int idx = 0;
    for(auto &[a,b,c] : ABC){
        cin >> a >> b >> c;
        M[{a,b}].push_back(idx);
        M[{b,c}].push_back(idx);
        M[{a,c}].push_back(idx++);
    }

    bool yes = true;
    vector<int> LR(N,-1);
    for(int i=0; i<N; i++){
        if(LR.at(i) != -1) continue;
        LR.at(i) = 0;
        queue<int> Q; Q.push(i);
        while(Q.size()){
            int pos = Q.front(); Q.pop();
            auto [a1,b1,c1] = ABC.at(pos);
            for(auto to : M[{a1,b1}]){
                if(to == pos) continue;
                auto [a2,b2,c2] = ABC.at(to);
                
                int lr = LR.at(pos);
                int t = 0;
                if(a2 == a1 && c2 == b1) t = 1;
                lr ^= 1^t;

                if(LR.at(to) == -1) LR.at(to) = lr,Q.push(to);
                else if(LR.at(to) != lr){yes = false; break;}
            } 
            if(!yes) break;
            for(auto to : M[{b1,c1}]){
                if(to == pos) continue;
                auto [a2,b2,c2] = ABC.at(to);
                
                int lr = LR.at(pos);
                int t = 0;
                if(a2 == b1 && c2 == c1) t = 1;
                lr ^= 1^t;


                if(LR.at(to) == -1) LR.at(to) = lr,Q.push(to);
                else if(LR.at(to) != lr){yes = false; break;}
            }
            if(!yes) break;
            for(auto to : M[{a1,c1}]){
                if(to == pos) continue;
                auto [a2,b2,c2] = ABC.at(to);
                
                int lr = LR.at(pos);
                int t = 0;
                if(a2 == a1 && c2 == c1) t = 1;
                lr ^= t;

                if(LR.at(to) == -1) LR.at(to) = lr,Q.push(to);
                else if(LR.at(to) != lr){yes = false; break;}
            }
            if(!yes) break;
        }
        if(!yes) break;
    }

    if(yes) Yes();
    else No();
}