| http://www.w3.org/ns/prov#value | - In that case, a bottom of valley 17C may be a flat surface parallel to a top surface of tips 16C and 16D. Alternatively, valley 17C may define a non-flat surface such as a concave or convex arc. [0030] As shown in FIG. 5, tips 16E and 16F may define tapered shapes with flat tops.
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