Symmetries D4, strongly invertible
Lists (r, p2, D4) (of coordinates along the path)
Fourier series (r, p2, D4) (of coordinate functions parametrized in [-π,π])
Scad files (r, p2, D4) (for use in Openscad or similar compiler)
Stl files (r, p2, D4) (for use in a 3D printer, etc)
List of knots, table of symmetries
14.6.15