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BASIC ORIGAMI-FOLDS
Below are explanations for 3 folds which are used many times in origami.
Valley-fold:

Fold the piece above the red line
The valley-fold is ready.
to the front, by making a fold
over this line.


Mountain-fold:

Fold the piece above the red line
The mountain-fold is ready!
to the back, by making a fold over
this line.

Inside reverse fold:

Make a fold over the red line, over both
The inside reverse fold is ready.
layers of the model. Unfold this fold after
you made it. Then make a mountain-fold
over the upper layer of the model
(see red line) and a valley-fold on the
layer on the back. Push or pull the end
at the arrow down while you make these
2 folds.
