#!/bin/python

import sys


def gen(a, c):
    if c > (len(a) - 1) * len(a) / 2:
        return None
    # print a
    # print c
    # print "==============="
    l = len(a)
    if l <= 1:
        if c == 0:
            return a
        else:
            return None
    p = c - (l - 1)
    for i in range(l - 1):
        # print a
        # print i
        # print a[:i]
        left = a[:i]
        right = a[i+1:]
        for it in range(p + 1):
            left_1 = gen(left, it)
            right_1 = gen(right, p - it)
            # print a[i], left_1, right_1
            if left_1 is not None and right_1 is not None:
                return [a[i]] + left_1 + right_1
    return None

q = int(raw_input().strip())
for a0 in xrange(q):
    length, c = raw_input().strip().split(' ')
    length, c = [int(length), int(c)]
    arr = range(1, length + 1)
    result = gen(arr, c)
    if result is None:
        print -1
    else:
        print " ".join(map(str, result))
    # your code goes here