Page 500 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"
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5. Pull the Half Hitch tight against the round turn.
Untying: Undo the Half Hitch, then pull the working end through the round
turn. If you can’t pull the working end through, loosen the round turn by
pulling slack from the standing part.
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