@aans12 rewatched this and I think what this lesson is saying is that this is why you can't add guarantee as a indicator word. Any thoughts?

I am getting confused about the "guarantee" concept. In the earlier lessons, I believe it was stated that "the sufficient concept is strong enough to guarantee the conclusion and the necessary concept, if not true, the argument falls apart". It was also said that sufficiency = subsets and necessity = supersets. How does that work within this lesson? Maybe I need to start this entire conditional logic section over, but when I start to think I understand it, the new comparisons and words trip me up.