Which one of the following is an acceptable schedule for the librarians, listed in order from Monday through Saturday?

on January 4, 2022

Set up for rule 5

Hello, so rule five start with unless, is it the same as logical reasoning where "unless" introduces a necessary then we negate the sufficient?

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Jordan on January 13, 2022

Hey @Lisam!

Great question, and yes it's the same idea! This is indeed a necessary. Therefore, if the necessary is not triggered, that's sufficient for the alternative to happen! Another way to say that is that Leung will ALWAYS be on desk duty earlier than Flynn except for if Leung is on Saturday, in which case he doesn't have to be earlier than Flynn. And indeed, it's impossible in such a case because Saturday is the last day of the game.

Therefore, unless L is on Saturday he is pretty early in the week as he has to be before F and some others, and F has to be before some other pieces too!

I hope this helped, if you have further questions don't hesitate to ask!