#!/bin/python

import sys

def rec(c,l,ret,d):
    ret.append(1000000000-d)
    if _len > c or c > (_len * (_len - 1)) / 2:
        return ret
    if c == (_len * (_len - 1)) / 2:
        return ret
    rec(c-_len+1,l-2,ret,d+1)

q = int(raw_input().strip())
for a0 in xrange(q):
    _len,c = raw_input().strip().split(' ')
    _len,c = [int(_len),int(c)]
    ret=[]
    if c > (_len * (_len - 1)) / 2:
        print "-1"
        continue
    if c == (_len * (_len - 1)) / 2:
        for i in xrange(_len,0,-1):
            sys.stdout.write(str(i) + " ")
        sys.stdout.write("\n")
        continue
    ret = ""
    tmp = rec(c-_len+1,_len-2,[],0)
    for i in tmp:
        ret += str(i) + " "
    print tmp