| http://www.w3.org/ns/prov#value | - For example, a plug 26 may be retained by friction, adhesion, tension, pressure, or other mechanisms; may be retained mechanically, as by a notch, hole, slot, tab, ridge, lip or other feature of a tube 14, of the plug 26 itself, or by any combination of such elements; or by any other mechanism or method suitable to releasably retain a plug while allowing its removal at a desired time.
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