#!/bin/python

import sys

def minimum_comp(l):
    if(l==1):
        return 0
    if(l==2):
        return 1
    if(l==3):
        return 2
    if(l==4):
        return 4
    return l-1+minimum_comp(l-2)

def swap(lst, l, diff):
    #print "diff=", diff
    while(diff>0):
        if(diff>=(l-2)):
            diff = diff-(l-2)
            t = lst[0]
            lst[0] = lst[1]
            lst[1] = t
        else:
            ch = l-2-diff
            t = lst[ch]
            lst[ch] = lst[ch+1]
            lst[ch+1] = t
            diff = 0
          
    
q = int(raw_input().strip())
for a0 in xrange(q):
    l,c = raw_input().strip().split(' ')
    l,c = [int(l),int(c)]
    mn = minimum_comp(l)
    mx = (l*(l-1))/2
    lst = range(1,l+1)
    if(c<mn or c>mx):
        print -1
        continue
    diff = mx-c
    swap(lst, l, diff)
    for el in lst:
        print el,
    print ""
    # your code goes here