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Some Hints:
Use pad to build the knot. "-" and "+" to shorten/lengthen the piece. "<" and ">" to bend it. Add cord to go on. To change upside-down a crossing, click on piece below (it will change color), then press the button "take over".
You have to know: one click to bend make 45°. Next click make 120°. If you need 90° you can do: 1) bend 2) add cord 3) bend again.
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