| http://www.w3.org/ns/prov#value | - other relief patterns can provide the same exit pupil 102 (FIG. 4) or a similar exit pupil as long as the first relief pattern in quadrants A and C is the inverse of the second relief pattern in quadrants B and D. [0087] Referring to FIGS. 13A and 13B, although the cell regions 172 are square, they can have other shapes such as pentagons, hexagons or any other shape where all the boundaries of eac
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