How to tie a Reef (Square) knot

And avoid getting a Granny Knot (the information below is extracted from Wikipedia and other sources.)

A Reef knot is formed by tying a left-handed overhand knot and then a right-handed overhand knot, or vice versa.  A common mnemonic for this procedure is “Right over Left, Left over Right makes a knot both tidy and tight“. Or the reverse.

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A Granny knot results when you do two consecutive overhands of the same handedness. The granny knot is a weaker knot than the reef knot.

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The working ends of the reef knot must emerge both at the top or both at the bottom, otherwise a Thief knot results.

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