|Step 13: Turn over to the other side.|
|Step 14: Fold the top layer down like you did on the other side.|
|Step 15: Fold the top flaps down to the side as shown. (Don't worry about the crease in the middle, I messed up.)|
|Step 16: Now fold a small portion of the top corner of both sides down as shown.|
|Step 17: Fold in the left and right corners as shown.|
|Step 18: Just turn the figure around and you'll have a working origami heart envelope.
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