Dear All, It comes to my attention that cliffordunit class was not supplied with (un)archiving methods. I am attaching a trivial patch for this. Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv@maths.leeds.ac.uk www: http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://www.worldscientific.com/worldscibooks/10.1142/p835