| http://www.w3.org/ns/prov#value | - nd explanatory marking thereon, which marking appears successively as the application of the picture elements proceeds. 3; The picture element-s may be adhered to the base and to each other, or they may be provided with means such as depressions and projections so disposed that upon engagement with each other a superimposed element is held in proper position in relation to an underlying element.
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