Page 438 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"

7. The knot will collapse into its proper shape as the slack is removed. Pull the standing parts to tighten.

Untying: Each rope’s working end is captured by a bight in its own standing

part. Working with either rope, push the bight toward the standing part; pull
slack from the standing part then free the working end of the other rope.

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