#!/bin/python3

import sys

fibo = {}
maxi = 1
fibo[1] = 0

def fib(n):
    global maxi
    if n in fibo:
        return fibo[n]
    for i in range(maxi+1,n+1):
        fibo[i] = fibo[i-1] + (i-1)
        maxi = n    
    return fibo[n]



q = int(input().strip())
for a0 in range(q):
    len,c = input().strip().split(' ')
    len,c = [int(len),int(c)]
    if(c > fib(len)):
        print('-1')
        continue
    if (c== fib(len)):
        w = list(reversed([i for i in range(1,len+1)]))
        [print(i,end=" ") for i in w]
        print("")
        continue       
    for i in range(1,len):
        l = list()
        if(c==fib(len)-i):
            for j in range(1,len+1):
                if(j%2==1):
                    l.append(j)
                else:
                    l.insert(0,j)            
            [print(i,end=" ") for i in l]
            print("")
            break