Here is an example using the include file(s) in 
'hknots.zip', 'harmonic' parameterizations(1) of 
knots. hknots.zip will, (within minutes?), be put
in povray.binaries.utilities.
Suggestions regarding the image are welcome, but
I place it here mostly to point to the include file.

Reference:
	(1) http://www.carthage.edu/~trautwn/

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