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