t = int(input())
for _ in range(t):
    n,x = map(int, input().split())
    if n <= x//4:
        print(-1)
    else:
        ans = [x for x in range(1,n)]
        c = x-sum(ans)
        if c <= n-1:
            print(-1)
        else:
            ans.append(c)
            print(*ans)