These examples would be much more helpful if they were kept in the same context. For example, if the sufficient condition were illustrated here using the “If the Chancellor's nefarious plan…” bit. That would allow the reader to compare them instead of trying to compare two different sentences while learning the concept.

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Question 12 answer "What matter is that he did not kill Arya." What matters , right?

Question #4 looks like the 'chained' answer was input incorrectly. Not only does it match the 'separate' answer, but it's wrong.