Can you find the 7 lettered "Good Words"

A "good" word is any seven letter word consisting of letters from [A; B; C] (some letters may be absent and some letter can be present more than once), with the restriction that A cannot be followed by B, B cannot be followed by C, and C cannot be followed by A. How many "good" words are there?

Note: This sum is from ISI entrance exam.

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