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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