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Origami Preliminary Base Instructions
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Origami Preliminary Fold
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Origami Basics: Preliminary Base - YouTube
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How to Origami a preliminary origami base « Origami :: WonderHowTo
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File:Origami preliminary base.svg - Wikimedia Commons
Origami Preliminary Base Instructions
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Origami/Techniques/Model bases - Wikibooks, open books for an open world
Origami Preliminary Fold
