#include <bits/stdc++.h>

using namespace std;

int main(){
    int q;
    cin>>q;
    
    while(q--){
        int l ,c;
        cin>>l>>c;
        
        if(c%2!=0 || 2*c>(l-1)*l)
            cout<<-1;
        
        else{
            
            for(int i = 1; i<=l; i++){
                
                if(i == 1)
                    cout<<1+c/2<<" ";
                
                else if(i == 1+c/2)
                    cout<<1<<" ";
                
                else 
                    cout<<i<<" ";
            }
        }
        
        cout<<endl;
    }
    return 0;
}