#!/bin/python

import sys


q = int(raw_input().strip())
for a0 in xrange(q):
    len,c = raw_input().strip().split(' ')
    len,c = [int(len),int(c)]
    # your code goes here
    upBound = (len*(len-1))/2
    lowBound = (len-1)
    if c>upBound or c<lowBound:
        print -1
    else:
        print " ".join(str(len+1-i) for i in range(1,len+1))