Web con gráficos de nudos para que hagan los niños - Aprender es un juego
Hook Knots - Tying Tricks, Choice, and Instructions
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Among high quality knots, the butterfly loop is perhaps the easiest to remember how to tie correctly. Start by simply making two twists in the same direction to form the two loops. Then wrap the outer loop around the standing part and pull it through the hole of the inner loop.