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Logic Diagrams
Two overlapping circles. Tap a thing, then tap the circle it belongs to — the middle if it fits BOTH.
Left circle is one rule, right circle the other
The middle is for things that fit BOTH
Outside is for things that fit neither
Progressive difficulty
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Venn Diagrams
Sort the items into the correct zones!
Neither
Red
Square
Both
Tap an item, then tap where it belongs
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Brilliant!