#!/bin/python
from __future__ import print_function
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
    if (c > len * (len - 1) / 2) or (c < len - 1):
        print ("-1")
    else:
        dim = len
        left = 0
        right = dim - 1
        v = [0 for i in range(0, len)]
        while dim != 0:
            dim = dim - 1
            if c % 2 != dim % 2:
                v[left] = dim + 1
                left = left + 1
                c = c - dim
            else:
                v[right] = dim + 1
                right = right - 1
                c = c - dim + 1
        for token in v:
            print (token, end=' ')
        print ("\n", end='')