func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     ;     int ts;     cin >> ts;     while (ts--) {       long long n, i, vis[500] = {0}, a;       cin >> n;       for (i = 1; i <= 2 * n; i++) {         cin >> a;         if (vis[a] == 0) {           cout << a <<    ;         }         vis[a] = 1;       }       cout << endl;     }   }   