#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    int temp = 2;
    int j = n;
    for (int i = 1; i <= n; i++) {
      cout << j * temp << " ";
      j++;
    }
    cout << endl;
  }
}
