| http://www.w3.org/ns/prov#value | - wer levels relative to each other and below said flat bottom, at least one of said game pieces fitting into the portion of said recess of lower level, the latter recess being of a size and shape corresponding to said last mentioned game piece, the game piece fitting in the recess of lower level being of such thickness as to extend above the flat surface at the upper level so that its sides form in
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