T=int(input().strip())
for _ in range(T):
 N,X=map(int,input().strip().split())
 if X<(N*(N+1))//2:print(-1);continue
 A=list(range(1,N+1));diff=X-sum(A)
 for i in range(N-1,-1,-1):
  if diff<=0:break
  add=min(diff,10**18-A[i]);A[i]+=add;diff-=add
 print(-1 if diff else ' '.join(map(str,A)))