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


int main() {
   long long int q;
    cin>>q;
    while(q--)
       {
        long long int a,b;
        cin>>a>>b;
           if(a==1 && b==0)
            cout<<1<<endl;
            else if(b<(a-1))
             cout<<-1<<endl;
           else if(b>(((a-1)*a)/ b2))
                   cout<<-1<<endl;
                   else
            {
                if(a-b==1)
                    {
                    for(int i=1;i<=a;i++)
                        cout<<i<<" ";
                }
                else
                    {int flag=1;
                    for(int i=a;;i-=2){
                        if(i>0)cout<<i<<" ";
                        else
                       break;
                    }int i;
                     if(a%2==0)i=1;else i=2;
                     for(;i<=a-1;i+=2)
                     {   
                             cout<<i<<" ";
                          
                     }
                }
                cout<<endl;
            }
        
}
    return 0;
}