| http://www.w3.org/ns/prov#value | - Referring to FIGS. 6 and 7, while the inner and outer sensing elements are shown as a circular element and a circular ring, respectively, the elements could have other shapes, such as a polygon and a polygonal annulus, e.g., a square and a square ring as shown in FIG. 6, or a pentagon with a pentagonal ring as shown in FIG. 7.
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