func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     int test;     cin >> test;     while (test--) {       int n;       cin >> n;       for (int i = 2 * n, j = 0; j < n; i += 2, ++j) {         cout << i <<    ;       }       cout << endl;     }     return 0;   }   