@visualcreed I can't wait for the law school headache, and the law firm headache, and the headache that the clients will give. The opposing counsel headaches, the court headaches, bring them all on!
That question gave me a headache when I first encountered it a long time ago. But @DumbHollywoodActor nailed it. Follow J.Y's principle with negating necessary and negating sufficient when indicators kick in, and you should be fine.