On a particular island, there live knights, who can only tell the truth, knaves, who can only lie, and werewolves, who can also only lie.
You come across a particular trio of native islanders named Xavier, Yvette, and Zander. They each make a statement:
If you know that amongst these three there is one werewolf, one knave, and one knight, then what must be true about Zander?
List all the possible cases if you're having trouble.