#include <iostream>
#include <cassert>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int t; cin >> t;
  while (t--) {
    int N; long long X; cin >> N >> X;
    long long a = (long long)N * (N + 1) / 2LL;
    if (a > X) {
      cout << -1 << endl;
    } else {
      long long diff = X - a;
      for (int i = 1; i < N; i++) {
	cout << i << ' ';
      }
      cout << (long)N + diff << endl;
    }
  }
  return 0;
}