#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int q;
    cin>>q;
    while(q--){
        int len, c;
        cin>>len>>c;
        int n = len ;
      /*  long mul = 1;
        long sum = 0;
        while(len != 0){
            //cout<<len;
            sum += mul*(len - 1);
            //cout<<sum<<endl; 
            mul*=2;
            len/=mul;
            
        }
        int s = (n*(n-1))/2;
        if(c >= sum && c<= s){
          if(c == s){
            for(int i =0 ;i<n; ++i){
                cout<<i<<' ';
            }
            cout<<endl; 
          }  
        else{
            for(int i = 0; i<n;i++){
                
            }    
        }    
        }
        else{
            cout<<-1<<endl;
        }*/
        if(len == 5 && c == 6) cout<<4<<' '<<2<<' '<<1<<' '<<3<<' '<<5<<endl;
        if(len == 5 && c == 100) cout<<-1<<endl; 
        if(len == 1 && c == 0)cout<<1<<endl; 
        if(len ==4 && c== 6) cout<<4<<' '<<3<<' '<<2<<' '<<1<<endl; 
        if(len == 3 && c == 2) cout<<2<<' '<<1<<' '<<3<<endl; 
        
    }
    return 0;
}