Use a comma before 'and' when it merges two sentences into one. Do not use a comma before 'and' in a list of two. Only use a comma in a list of three or more if your region uses the serial comma.
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Christina Schrunk on X: Comma before so: If you can say so that, no comma is needed before so. This is a subject I've posted about before, but it's something I use
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Comma Rules!. - ppt download
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Comma Before Because When to Use A Comma Before BECAUSE • 7ESL