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CS609 - System Programming

Question(s) similar to the following:

When asked to give a recursive definition for the language PALINDROM over the alphabet S = {a, b}, a student wrote:

Question 1: When asked to give a recursive definition for the language PALINDROM over the alphabet S = {a, b}, a student wrote:

Answer: Suggest Edit

Rule 1 a and b are in PALINDROM.
Rule 2 If x is in PALINDROM, then so are AxA and BxB
Unfortunately all the words in the language defined above have an odd length and so it is not all of PALINDROM. Fix this problem.
Give a recursive definition for the language EVENPALINDROM of all palindromes of even length

Similar Questions:

Question 2: When asked to give a recursive definition for the language PALINDROM over the alphabet S = {a, b}, a student wrote:

Answer: Suggest Edit

Rule 1 a and b are in PALINDROM.
Rule 2 If x is in PALINDROM, then so are AxA and BxB
Unfortunately all the words in the language defined above have an odd length and so it is not all of PALINDROM. Fix this problem.
Give a recursive definition for the language EVENPALINDROM of all palindromes of even length
Past Papers of CS609 - System Programming
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