import java.util.*;

/**
 * Created by dhairyathakkar on 14-02-2017.
 */
public class Contest101Hack_1 {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int q=sc.nextInt();
        for(int i=0;i<q;i++){
            int len=sc.nextInt();
            int comp=sc.nextInt();
            int max=len*(len-1)/2;
            if(max<comp){
                System.out.println(-1);
            }
            else if(max==comp){
                for(int k=len;k>=1;k--){
                    System.out.print(k+" ");
                }
                System.out.println();
            }
            else{
                int num=max-comp;
                int g[]=new int[len];
                g[0]=num;
                int y=len;
                for(int k=1;k<len;k++){
                    if(y!=num){
                        g[k]=y;
                        y--;
                    }
                    else{
                        y--;
                        k--;
                    }
                }
                for(int k=0;k<len;k++){
                    System.out.print(g[k]+" ");
                }
                System.out.println();
            }
        }
    }
}