#!/bin/python3

import sys


q = int(input().strip())
for a0 in range(q):
    len,c = input().strip().split(' ')
    len,c = [int(len),int(c)]
    # your code goes here
    if c > len * (len-1) / 2:
        print(-1)
    else:
        my_nums = [int(x) for x in range(1,len+1)]
        print(my_nums)