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4. Define a grammar in BNF to generate all palindromes of characters a, b. (Eg. Following are palindromes aa, abba, a, bab, ababa, etc. Non-palindromes

4. Define a grammar in BNF to generate all palindromes of characters a, b. (Eg. Following are palindromes aa, abba, a, bab, ababa, etc. Non-palindromes abab, baa, aaab, etc.) 4 points)

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