import java.io.PrintWriter;
import java.util.*;

public class Main {

    public static void vectorPrint(Vector lis){

        PrintWriter out = new PrintWriter(System.out);
        for (int i=0 ; i<lis.size() ; i++){
            out.print(lis.get(i));
            if ( i != lis.size()-1){
                out.print(' ');
            }else{
                out.print('\n');
            }
        }
        out.flush();
    }

    public static void main(String[] args){

        Scanner sc = new Scanner(System.in);

        int TT = sc.nextInt();

        for (int lp=0; lp<TT ; lp++){
            long N = sc.nextLong();
            long X = sc.nextLong();
            
            Vector lis = new Vector();
            for (long i=0; i<N-1 ; i++){
                lis.addElement(i+1);
                X -= i+1;
            }
            if (X >= N){
                lis.addElement(X);
                vectorPrint(lis);
            }else{
                System.out.println("-1");
            }
        }
    }
}