Question: Determine a regular expression for the language L over the alphabet { a , b } that ends with a letter that is different from

Determine a regular expression for the language L over the alphabet {a, b} that ends with a letter that is different from the letter that it starts with. For example, ab, ababab and aaaaabaaaabbbbbb are words in L but aaa, baabbaab, aaaaabaaaaaa and abaa are not.

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