When to Use Comma Before "And" | Grammarly
https://www.grammarly.com/blog/comma-before-and/
Comma Before And That Joins Two Independent Clauses. The word and is a conjunction, and when a conjunction joins two independent clauses, you should use a comma with it. The proper place for the comma is before the conjunction. On Monday we’ll see the Eiffel Tower, and on Tuesday we’ll visit the Louvre.
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