/* -*- coding: utf-8 -*-
 *
 * 2560.cc:  No.2560 A_1 < A_2 < ... < A_N - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

typedef long long ll;

/* global variables */

/* subroutines */

/* main */

int main() {
  int tn;
  scanf("%d", &tn);

  while (tn--) {
    int n, x;
    scanf("%d%d", &n, &x);

    ll s = (ll)n * (n + 1) / 2;
    if (s > x) { puts("-1"); continue; }

    for (int i = 1; i < n; i++) printf("%d ", i);
    printf("%d\n", x - n * (n - 1) / 2);
  }
  return 0;
}