import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
    private static long counter = 0;

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int q = in.nextInt();
        for(int a0 = 0; a0 < q; a0++){
            int len = in.nextInt();
            int c = in.nextInt();

            long max = getMaxCmpCount(len);
            long min = getMinCmpCount(len);
            //System.out.println("---Min:" + min + " Max:" + max + " Len:" + len);
            if(c > max || c < min){
                System.out.println(-1);
            }else{
                System.out.println(printNumString(len));
            }
        }
    }
    
    private static String printNumString(int len){
        if(len == 1){
            return getNextNumber();
        }else if (len == 2){
            return getNextTwoNumber();
        }else if (len == 3){
            return getNextThreeNumber();
        }else{
            if(len%2 == 1)
                return printNumString((len-1)/2) + " " + getNextNumber() + " " + printNumString((len-1)/2);
            else
                return printNumString(len/2) + " " + getNextNumber() + " " + printNumString((len-1)/2);
        }
    }
    
    private static String getNextNumber(){
        return ++counter + "";
    }
    
    private static String getNextTwoNumber(){
        return getNextNumber() + " " + getNextNumber();
    }
    
    private static String getNextThreeNumber(){
        String min = getNextNumber();
        String mid = getNextNumber();
        String max = getNextNumber();
        return mid + " " + min + " " + max;
    }
    
    public static long getMinCmpCount(int len){
        if(len == 1)
            return 0;
        else if(len == 2){
            return 1;
        }else if (len == 3){
            return 2;
        }else{
            if((len-1)%2 == 0){
                return (len-1) + getMinCmpCount((len-1)/2) + getMinCmpCount((len-1)/2);
            }else{
                return (len-1) + getMinCmpCount((len-1)/2) + getMinCmpCount((len-1)/2 +1);
            }
        }
    }
    
    public static long getMaxCmpCount(int len){
        long maxSum = 0;
        while(len-1 > 0){
            maxSum += --len;
        }
        return maxSum;
    }
}