Geometry directives are special commands enclosed between two lines $Start_xxx ....... $End_xxx where "xxx" stands for "expansion", "translat" or "transform". They allow to provide respectively a coordinate expansion, a coordinate translation or a coordinate roto-translation of the bodies embedded between the starting and the ending directive lines. Directives can be nested. The body definitions which are contained between the lines "$Start_xxx" and "$End_xxx" are automatically modified according to the syntax described below.
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