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File:Figure8knot-rose-limacon-curve.svg - Wikipedia
Get Knotted! Okay, but There Really is a Limit
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Knot Tie-ing: Adjustable loop and knot that gets more secure as
File:Figure8knot-mathematical-knot-theory.svg - Wiktionary, the free
Figure-eight knot
Knots Brilliant Math & Science Wiki
Tricolorability - Wikipedia
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Knots Brilliant Math & Science Wiki