#include<bits/stdc++.h>
using namespace std;
using ll=long long;

int main(){
  ll t;
  cin>>t;
  while(t--){
    ll n,x;
    cin>>n>>x;
    ll sum=0;
    vector<ll> ans;
    for(ll i=1;i<=n-1;i++){
      ans.push_back(i);
      sum+=i;
    }
    if(x-sum<n){
      cout<<-1<<endl;
    }else{
      for(ll u:ans){
        cout<<u<<" ";
      }
      cout<<x-sum<<endl;
    }
  }
}