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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int q,c,n,k,l;
    cin>>q;
    while(q--){
        cin>>n>>c;
        if(n==1 && c==0) cout<<"1\n";
        else if(n==1 && c!=0) cout<<"-1\n";
        else if(n!=1 && c==0) cout<<"-1\n";
        else if(n==2 && c>1) cout<<"-1\n";
        else if(n==2 && c==1) cout<<"1 2\n";
        else{
            k=((n-1)*(n))/2; //max
            l=(n-2)*2;
            if(c==k){
               for(int i=1;i<=n;i++) cout<<i<<" ";
               cout<<endl; 
            }
            else if(c>k || c<l) cout<<"-1\n";
            
            else {
                cout<<"-1\n";
            }
        }
    }
    return 0;
}