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"Yoshizawa–Randlett system is a diagramming system used to describe the folds of origami models"
https://en.m.wikipedia.org/wiki/Yoshizawa%E2%80%93Randlett_system
"Yoshizawa–Randlett system is a diagramming system used to describe the folds of origami models"
https://en.m.wikipedia.org/wiki/Yoshizawa%E2%80%93Randlett_system