Question: Write a regular expression that defines the language over {a,b,c}, consisting of all words in which c's can only occur when an odd number of

Write a regular expression that defines the language over {a,b,c}, consisting of all words in which c's can only occur when an odd number of a's have been seen up to that point. So c's can occur between the 1st and 2nd a's, and between the 3rd and 4th a's, but not between the 2nd and 3rd a's (and so on).

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