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In page Fisherman's knot:

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These properties are well suited to fishing, so the fisherman's knot is often used with fishing line. However it can slip when using modern nylon monofilament line, which is more slippery than historic fishing materials.[1] If more holding strength is required, the overhand knots can be made with more turns, as in the double fisherman's knot, and triple fisherman's knot. Other knots sometimes provide superior performance with nylon lines, such as the blood knot.[citation needed]