English is redundant following intelligible and you shouldn't use a comma before the word and.
If you're going to chose grammer for a flanking attack on content, you might want to load your own wits first.
English
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Ha ha haaaa. What? Grammer? You're having a laugh.
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Um...neither of those are errors. The redundant thing sounds like your personal opinion, and my "and" was connecting two independent clauses, so a comma is perfectly acceptable. Muh wits is loaded.