Counting Rectangles

Level pending

BillyBob and Joe are playing a game, where each is drawing a lines. BillyBob draws horizontal lines...and Joe draws vertical lines. BillyBob draws five lines, and Joe draws eight lines. In the end, BillyBob and Joe end up with a beautiful rectangle! How many total rectangles are in the rectangle that they drew (yes...you may include the big rectangle)?

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