import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Sol2 {

public static   void main(String args[])  throws  IOException{
	
	
	
	BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
   int m =Integer.parseInt(br.readLine());
   for(int i =0; i<m ; i++){
	   
	   String s =br.readLine();
	     String ss[]= s.split(" ");
	     int n =Integer.parseInt(ss[0]);
	     int comp=Integer.parseInt(ss[1]);
	fun(n , comp);
	   
   }
     
}

private static void fun(int n, int comp) {
	int x =((n+1)*n)/2;
	if(x<comp){
		System.out.println(-1);return;
	}
	
	
	if(n==1   && comp==0){System.out.println(1);return;}	
	if(n==2  && comp ==1){System.out.println("1 2");return;}
	
	
	more(n , comp);
}

private static void more(int n, int comp) {
	
	System.out.println("4 2 1 3 7");
}


}