def I(): return input()
def N(): return int(input())
def M(): return map(int,input().split())
def L(): return list(map(int,input().split()))

#-----------------------------------------


T = N()
for test in range(T):
  N,X = M()
  mini = N*(N+1)//2
  
  if mini > X:
    print(-1)
    continue
  
  for i in range(N-1):
    print(i+1,end = " ")
  
  print(N + X-mini)