| http://www.w3.org/ns/prov#value | - More specifically, visibility constraints include, but are not limited to, the following: intensity of sub-features in the second set that are not detectable by the human eye; intensity of sub-features in the second set that are not detectable by a camera, video camera, or other image capturing systems, however, are detectable by a scanning system to be described herein, which may retrieve the emb
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