#!/bin/ruby

q = gets.strip.to_i
for a0 in (0..q-1)
    len,c = gets.strip.split(' ')
    len = len.to_i
    c = c.to_i
  max = len * (len - 1) / 2

  if c > max
    puts -1
  elsif max == c
    puts (1..len).to_a.reverse.join(' ')
  else
    diff = max - c
    arr = (1..len).to_a.reverse
    diff.times { arr.rotate! }
    puts arr.join(' ')
  end
end