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A reef knot is formed by taking an overhand knot and repeating the overhand knot process (pass one end of the line over the line, pass the line around, then feed the line through the loop) with the opposite end of the line (Fig. 1): if two overhand knots are made the same way, the result will be a 'granny' (Fig. 2).

Reef Knot

A reef knot is formed by taking an overhand knot and repeating the overhand knot process (pass one end…