#include <bits/stdc++.h>
using namespace std;
const long long M = 1e9 + 7;
void inp(long long a[], long long n) {
  for (long long i = 0; i < n; i++) cin >> a[i];
}
void solve() {
  long long n;
  cin >> n;
  long long x = 4 * n;
  for (long long i = 0; i < n; i++) {
    cout << x << " ";
    x = x - 2;
  }
  cout << '\n';
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long t = 1;
  cin >> t;
  while (t--) solve();
}
