def solve():
  n, x = map(int, input().split())
  if n * (n + 1) // 2 > x:
    print(-1)
    return

  ans = [1]
  x -= 1
  for i in range(1, n):
    if i == n - 1:
      ans.append(x)
    else:
      ans.append(i + 1)
      x -= i + 1
  print(*ans)



t = int(input())
for i in range(t):
  solve()