def func(n,x):
 if n*(n+1)//2>x:
  return False
 else:
  l=[i for i in range(1,n)]
  l=l+[x-sum(l)]
  return(l)
 
t=int(input())
for i in range(t):
 n,x=map(int,input().split())
 if func(n,x)==False:
  print(-1)
 else:
  print(*func(n,x))