Page 411 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"

6. Tightening requires holding one standing part and pulling alternately on the two strands on the opposite
end of the knot, then switching to hold the other standing part and pulling alternately “new” opposite ends.

Untying: Grab one pair of crossing turns in each hand and flex the knot
back and forth until they loosen. Then pull both working ends through the

crossing turns.

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