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4. Problem 2.18b from the text: b. { w { a, b, c)' and w contains equal numbers of a's, b's, and cs). Let A

4. Problem 2.18b from the text: b. { w { a, b, c)' and w contains equal numbers of a's, b's, and cs). Let A Use part (a) to show that A is not a CFL

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