func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     std::cin.tie(0);     std::ios::sync_with_stdio(false);     long long n;     cin >> n;     if (n <= 5) {       cout << -1 << endl;     } else {       cout << 1 <<     << 2 << endl;       for (int i = 3; i <= n; i++) {         if (i % 2)           cout << 1 <<     << i << endl;         else           cout << 2 <<     << i << endl;       }     }     for (int i = 2; i <= n; i++) cout << 1 <<     << i << endl;     return 0;   }   