Q=int(input())
for _ in range(Q):
  N,X=map(int,input().split())
  y=N*(N+1)//2
  if y>X:
    print(-1)
    continue
  result=[0]*N
  for i in range(N-1):
    result[i]=i+1
    X-=i+1
  result[N-1]=X
  print(*result)