#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    long int q;
    cin>>q;
    while(q--){
        long int n;
        cin>>n;
        long int c;
        cin>>c;
        if(c == 0){
            for(long int i=1;i<=n;i++){
                cout<<i<<" ";
            }
            cout<<endl;
        }
        else if(n*n < c){
            cout<<-1<<endl;
        }
        else if((n*(n-1))/2 == c){
            for(long int i=n;i>=1;i--){
                cout<<i<<" ";
            }
            cout<<endl;
        }
    }
    return 0;
}