#!/bin/python3

import sys


q = int(input().strip())
for a0 in range(q):
    l1, c1 = list(map(int, input().split()))
    m = l1
    r = 0
    while (m >= 0):
        r += m - 1
        r -= 2
    if (r != r):
        print(-1)
    else:
        for i in range(l1):
            print(i + 1,end=' ')