| http://www.w3.org/ns/prov#value | - polygon aperture having at least 4N+2 sides, where N is a positive integer, with at least one side of the first intermediate polygon aperture being generally parallel to the first major crystal axis, and with the intersection of a second side and a third side of the first intermediate polygon aperture being located generally along the second major crystal axis, and b. anisotropically etching into
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