Create a flat origami model such that its crease-pattern graph consists of exactly 3 internal vertices and each of these vertices has degree 4.

a) Take a picture of your model and upload it.

b) Unfold your model and identify those three vertices and all valley and mountain creases. Take a picture and upload it.

c) Verify that the crease-pattern graph satisfies the 2-coloring property (Property 3) by color it. Take a picture an upload it.