Let ANTIPALINDROME be the language of all even-length strings over the alphabet  {a,b}  such that, for all i, the i-th letter from the start is different to the i-th letter from the end.  Examples of strings in this language include: ε,  ab, ba, aabb, abab, baba, bbaa, aaabbb, ... Give a Context-Free Grammar for the language ANTIPALINDROME.

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Intelligent Machines

Machines that use artificial intelligence to learn from the environment and past experiences to perform better in the presence of variability and uncertainty are called intelligent machines. Intelligence develops according to environment and experience. It is human-like behavior. When the computer system or any programmed machine learns from the inputs and corresponding outputs, it can be called an intelligent machine.