#!/bin/python3

import sys

def gen(arr, c):
    if c == 0:
        return arr
    i = 0
    less = []
    greater = []
    while c > 0 and i < len(arr)-1:
        less.append(arr[i])
        c -= 1
        i+= 1
    if i == len(arr)-1 and c == 0:
        return [arr[i]] + less
    elif i < len(arr)-1 and c == 0:
        return [arr[i]] + less + arr[i+1:]
    else:
        return [arr[len(arr)-1]] + gen(less, c)
        


q = int(input().strip())
for a0 in range(q):
    n,c = input().strip().split(' ')
    n,c = [int(n),int(c)]
    if c > (n-1)*n/2:
        print(-1)
    else:
        l = [i for i in range(1, n+1)]
        print(gen(l, c))