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