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I tried out the Venn Diagrams, and all of them are pretty straight forward - you put the problems in one, the other. Though I suggest making the diagram bigger, so then we wouldn't need to squish the numbers together. Also, for the diagram that says "even numbers" and "odd numbers", there can't be an even AND odd number less you are going to count zero. That would be a trick question to those who don't know their numbers well enough yet.