| 21. | The Venn diagram is constructed with a collection of simple closed curves drawn in the plane.
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| 22. | The following Venn diagram provides an overview of how the four units relate to each other:
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| 23. | Some of the Euler diagrams are not typical, and some are even equivalent to Venn diagrams.
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| 24. | Using Venn diagrams can be viewed as reasoning.
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| 25. | Venn diagrams typically represent two or three sets, but there are forms that allow for higher numbers.
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| 26. | He also showed that such symmetric Venn diagrams exist when " n " is 5 or 7.
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| 27. | Venn diagrams are similar to Euler diagrams.
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| 28. | Venn diagrams are helpful in visualizing laws.
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| 29. | Thus rotationally symmetric Venn diagrams exist if and only if " n " is a prime number.
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| 30. | We just commenced Venn diagrams and I seem to be having a lot of difficulty with them.
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