func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t-- > 0) {       int n;       cin >> n;       int a;       int f[51] = {0};       for (int i = 0; i < 2 * n; i++) {         cin >> a;         if (f[a] == 0) {           f[a]++;           cout << a <<    ;         }       }       std::cout <<   n ;     }     return 0;   }   