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How to make friendship bracelets

To make a friendship bracelet, you should cut several thread of various colours, and link all of them with a simple waiting knot.

Then you start the bracelet knots using two threads for each knot. There is only two kind of half-knots: the half-knot to the right, and the half-knot to the left. Because each bracelet node is a knot composed of two half-knots, there are only four types of nodes to make a bracelet.