Question: ( 3 points ) For an alphabet ? ? = { 0 , 1 } , a string xin ? ? * * is called

(3 points) For an alphabet ??={0,1}, a string xin??** is called a palindrome if x=xR, that
is,x is equal to its reversal. Let Asube??**, where A={xin??**|x=xR}. Define the language A
recursively?
(3 points) For an alphabet ??={0,1}, a string xin??** is called

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