Some Examples of the possible inhomogeneous fillings of a cell. 
 Upper left: a Prism. 
 lower left: Intersection of two Prisms. 
 Upper right: Intersection of three Prisms. 
 lower right: Union of ``upper left'' and ``lower left''. 
 The Prism in the upper left can be oriented in 2 x 3 different Kinds in a Cell, 
 the other three material Fillings are possible in 4 x 3 x 2 different
 Orientations. 
  
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