#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <cstring>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < int(n);i++)

void solve(){
  ll n,x;
  cin >> n >> x;
  if (n*(n+1)/2 > x){
    cout << -1 << endl;
    return;
  }
  vector<ll> a(n);
  ll now = 1;
  for (int i = 0; i < n-1;i++){
    a[i] = now;
    now++;
  }
  a[n-1] = x-now*(now-1)/2;
  for (auto e:a){
    cout << e << " ";
  }
  cout << endl;
}
int main(){
  int t;
  cin >> t;
  while(t--){
    solve();
  }
  
  return 0;
}