Let us use a Venn diagram to illustrate the subset of odd integers in the set of all positive integers not exceeding 10. Denote by B the set of all positive integers not exceeding 10, that is B={1,2,3,4,5,6,7,8,9,10}. Let A be its subset consisting of all odd integers, that is A={1,3,5,7,9}. Then the Venn diagram is the following:

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