This applet was written by Lisa Denise Murphy at the University of Illinois. Early drafts were written in 1997. The current version was last revised in January of 2000. Permission is given for students and teachers to use this applet, provided acknowledgement is made of the source. Anyone interested in using this applet in connection with any published paper or commercial venture should please first consult the author. Thank you.

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This page last revised January 19, 2000.