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Let A={a, b, c}. Find a regular expression r such that L(r) consists of all words w where: 2.28. Each word w=x 1 x 2

Let A={a, b, c}. Find a regular expression r such that L(r) consists of all words w where:

2.28. Each word w=x₁x₂x_n image text in transcribed L(r) has a property: x_k=c if k=2m.

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