func_code_string: #include <bits/stdc++.h>   using namespace std;   std::ostream& operator<<(std::ostream& os, pair<int, int> p) {     os << p.first <<  ,   << p.second;     return os;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int t;     cin >> t;     while (t--) {       long long int l, r;       cin >> l >> r;       if (l * 2 > r) {         cout << -1 <<     << -1 <<   n ;         continue;       } else {         cout << l <<     << 2 * l <<   n ;       }     }     return 0;   }   