func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long mod = 1e9 + 7;   void solve() {     long long n;     cin >> n;     if (n < 6)       cout <<  -1  << endl;     else {       cout <<  1 2 n2 3 n2 4 n1 5 n1 6 n ;       for (long long i = 7; i <= n; i++) {         cout << 2 <<     << i << endl;       }     }     cout <<  1 2 n ;     for (long long i = 3; i <= n; i++) {       cout << 2 <<     << i << endl;     }   }   signed main() {     long long t = 1;     ios_base::sync_with_stdio(false);     cin.tie(NULL);     while (t--) {       solve();     }   }   