#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;
    for(cin>>q;q;q--)
        {
            int n,c;
            cin>>n>>c;
            if(c>n*n)
                {
                    cout<<-1<<endl;
                    continue;
            }
            if(c==(((n)*(n-1))/2))
                {
                    for(int i=n;i>0;i--)
                        cout<<i<<" ";
                    cout<<endl;
                    continue;
            }
    }
    return 0;
}