T=int(input())
for i in range(T):
    N,X=map(int,input().split())
    ans=[]
    add=0
    for j in range(N-1):
        X-=j+1
        ans.append(j+1)
    if len(ans)!=0 and ans[-1]>=X:
        print(-1)
    else:
        ans.append(X)
        print(*(ans))