I've taken the author's code, changed it slightly, and placed it in a publicly viewable notebook on sagenb.org. Please feel free to view and edit the notebook.

I've taken the author's code, changed it slightly, and placed it in a publicly viewable notebook on sagenb.org. Please feel free to view and edit the notebook. http://www.sagenb.org/home/pub/2014/ http://www.sagenb.org/home/pub/2014/