Page 390 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"

5. To keep flat materials from bunching up, the knot must be tightened gradually and continually faired.

Untying: Pry the two crossing turns away from each other, then pull the

working ends through the crossing turns.

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