Answer:
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Explanation:
corners are mitered and inside corners are coped.
On an inside corner one piece goes all the way in to the corner. The second piece is coped to butt up to the first piece. That way if there is any movement in the walls or foundation there isn't as noticeable opening.
Try it with a few small pieces and you will see.
There is also a trick of making a model corner with the bottom of the sides where the molding meets cut out. This makes it easier to see how the back of piece being coped meets up to the other section.
