Originally Posted by cutebuns
So why do they all have to work for me and why do I need to know all of them? (I am sure that there are a few that I haven't come up with or read about)
intellectual curiosity ... that would account for your needing to know all of them. There was at least one technique that would give you quarter square triangles that you didn't mention, but I didn't want to mess up what you were doing, so I just kept quiet like a mouse <g>