#!/bin/python

import sys


q = int(raw_input().strip())
for a0 in xrange(q):
    le,c = raw_input().strip().split(' ')
    le,c = [int(le),int(c)]
    ans=[]
    t1=[]
    t2=[]
    if c==0:
        for i in range(1,le+1):
            ans.append(str(i))
        ans=" ".join(ans)
        print ans
    elif c>le*1.5:
        print -1
    elif le%2==0:
        for i in range(1,le+1):
            ans.append(str(i))
        ans=ans[::-1]
        ans=" ".join(ans)
        print ans
    elif le%2==1:
        for i in range(1,le+1):
            if i%2==1:
                t1.append(str(i))
            else:
                t2.append(str(i))
        t2.sort(reverse=True)
        ans=" ".join(t2)+" "+" ".join(t1)
        print ans