#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int t;
    cin >> t;
    rep(i,t){
        ll n,x;
        cin >> n >> x;
        if(x-(n*(n-1)/2)<n) cout << -1 << endl;
        else{
            rep(i,n-1){
                cout << i+1 << " ";
            }
            cout << x-(n*(n-1)/2) << endl;
        }
    }
    
}