| http://www.w3.org/ns/prov#value | - The illustrated flow-impeding recesses 160 are generally hemispherical recesses of generally uniform dimensions, but other embodiments may include flow-impeding recesses 160 with varying dimensions or other shapes, e.g., smaller or larger portions of a sphere, frustoconical or conical recesses, or recesses generally defining a parallelepiped volume, such as a cube.
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