#!/bin/python

import sys
su=[]
b=0
for i in range(1,100001):
        b+=i
        su.append(b)
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
    max_val=int((len*(len-1))/2)
    a=list(range(len+1))
    a=a[1:]
    if len>1:
        if c>max_val:
            print '-1'
        elif c==max_val:
            a=a[::-1]
            print ' '.join(map(str,a))
        else:
            z=min(su, key=lambda x:abs(x-c))
            if z==c:
                d=a[:su.index(z)+1][::-1]+a[su.index(z)+1:]
                print ' '.join(map(str,d))
            else:
                count=c-z-1
                e=a[:su.index(z)+1][::-1]+a[su.index(z)+1:]
                f=e[z]
                e=a[:su.index(z)+1][::-1]+a[su.index(z)+2:]
                e=e[:count]+[f]+e[count:]
                print ' '.join(map(str,e))
    else:
        if c==0:
            print '1'
        else:
            print '-1'