Reef knot
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Use two ropes. Cross over, right over left.
And under.
Cross over again. This time left over right.
And under.
Pull ends to tighten.
Use:
The reef knot is used for tying two ropes
of equal thickness together. Can also be used
for tying the reefing points on a sail when the
wind blows up and used to tie a triangular
bandage.