r#"Copyright 2001, softSurfer (www.softsurfer.com)
This code may be freely used and modified for any purpose                                                                                                                                
providing that this copyright notice is included with it.
SoftSurfer makes no warranty for this code, and cannot be held
liable for any real or imagined damage resulting from its use.
Users of this code must verify correctness for their application.
"#