func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long t;     cin >> t;     while (t--) {       long long n, m;       cin >> n >> m;       vector<long long> vis(n);       for (int i = 0, ggdem = m; i < ggdem; ++i) {         long long a, b, c;         cin >> a >> b >> c;         a--;         b--;         c--;         vis[b] = 1;       }       long long ve = -1;       for (int i = 0, ggdem = n; i < ggdem; ++i) {         if (vis[i] == 0) ve = i;       }       for (int i = 0, ggdem = n; i < ggdem; ++i) {         if (i != ve) {           cout << i + 1 <<     << ve + 1 <<   n ;         }       }     }     return 0;   }   