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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