T = int(input())

for i in range(T):
  N, X = map(int, input().split())
  if N * (N + 1) // 2 > X:
    print(-1)
  else:
    for i in range(N - 1):
      print(i + 1, end = " ")
    print(X - (N * (N - 1) // 2))