Local-plan_undi structure for face. In this constext, a face is represnted by two ordered lists, that describe the face border: 1 - a list of edges; (edges belonging to face) 2 - a list of border_steps; Cardinality of the list 2 is greather or equal than the cardinality of the list 1. Infact, both the two border_steps of an edge might have the same face.



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