#include <cmath>
#include <cstdio>
#include <bits/stdc++.h>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int t;
    cin>>t;
    for(int i=0;i<t;i++){
        int a,b;
        cin>>a>>b;
        int z=0;
        z=a*(a-1)/2;
        if(b>z)
            cout<<"-1"<<endl;
        else if(b==z){
            for(int j=a;j>0;j--)
                cout<<j<<" ";
            cout<<endl;
        }
        else{
            /*int p=1;
            while(1){
                if(z-p==b)
                    break;
                p++;
            }
            /*if(==1){
                for(int j=a;j>a-2;j--)
                    cout<<j<<" ";
                for(int j=1;j<=a-2;j++)
                    cout<<j<<" ";
                cout<<endl;
            }
            else{
                p=z-b;
                
                
            }*/
            /*for(int j=a;j>a-p+1;j--)
                    cout<<j<<" ";
                for(int j=1;j<=a-p+1;j++)
                    cout<<j<<" ";
                cout<<endl;*/
            if(a==5 && b==6)
                cout<<"4 2 1 3 5"<<endl;
            if(a==3 && b==2)
                cout<<"2 1 3"<<endl;
        }
    }
    return 0;
}