|  | How to make a simple quadruple origami leaf(page 7) |  | 
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 | 11. Apply the 2nd "inside reverse-fold" of the step #10. 
 Prepare to rotate the origami leaf model by 90 degrees. | 
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 | 12. Rotate the origami leaf model by 90 degrees. 
 Prepare to apply the 3rd "inside reverse-fold" . |