def solve
  n,x=gets.split.map &:to_i
  if n*(n+1)/2>x then
    p -1
    return
  end
  a=[]
  (1..n-1).each{|i|
    a.append(i)
  }
  a.append(x-a.sum)
  puts a.join ' '
end
gets.to_i.times{
  solve
}