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