| http://www.w3.org/ns/prov#value | - The form and size of this guide element which is preferably a guide groove depends on the size and configuration of the edge face of the support member to be inserted into said element and may for example be in the form of a rectangle, square, triangle, or semicircular, or the like, and is preferably positively engageable with the edge of the support member to be inserted.
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