| http://www.w3.org/ns/prov#value | - Thus, in particular embodiments, to present a desired face in a desired direction and to provide flexibility in choosing entry points into and exit points out of rotation areas 892, mobile drive units 20 may enter rotation areas 892 then perform one or both of a rotation that rotates both mobile drive unit 20 and inventory holder 30 and a rotation that rotates only mobile drive unit 20, in any app
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