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[Attachment] In order to facilitate editing and modification by those in need, the plain text document is provided as follows: Example 6. Given a natural number n, let X={1, 2, 3,..., Ar be r disjoint ternary elements of X subset, such that.
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Although the price of iPad is a bit high, the actual experience it brings is unambiguous. It is not easy for students to spend several thousand yuan to buy an iPad after saving money on food and drinks for several months. However, in order to enrich the experience, they have to a
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