| http://www.w3.org/ns/prov#value | - A polygonal mold for ground-covering stones, said polygonal mold having alternating projections and recesses nestable with companion recesses and projections on another mold, comprising:a mold (1) having a perimeter (2) in the general shape of a polygon selected from the group including rectangle and hexagon, said perimeter having a planar top surface (3), a bottom surface in a parallel plane (4),
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