#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;
        int ar[l+1]={0};
        for(int i=l;i>=1;i-- ) ar[i]=i;
        if(c>l*(l-1/2)) cout<<-1<<endl;
       else{
           
               
               for(int i=0;i<42;i++){prev_permutation(ar+1,ar+l+1);}
           for(int i=1;i<l+1;i++) cout<<ar[i]<<" ";cout<<endl;
           }
               
       }
    
    return 69;
}