import math, sequtils, strutils

let
  t = parseInt readLine stdin
  list = cumsummed toSeq (0..1000000)

for _ in 0..<t:
  let
    nx = stdin.readLine.split.map parseInt
    n = nx[0]
    x = nx[1]
    
  if x >= list[n]:
    var result = (1..<n).toSeq
    result.add x.pred list[n.pred]
    echo result.join " "
  else:
    echo -1