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Ok, I have scoped out our options for computer-controlled cutting, and here (PS7.pdf) is the resulting assignment, connecting with 2D symmetry groups. Note that the next assignment, to be posted shortly, will be due exactly a week later, and will also be based on computer-controlled cutting, relating to 3D symmetry groups. Note that the text of the assignment says that I will be allowing comments on this page, but I could not find any way to do that. So I will be creating an announcement that allows comments for the sake of holding any comments you may have.
Can't change a rubric once you've started using it.