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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