| http://www.w3.org/ns/prov#value | - A flooring system according to claim 16 in which:(a) the first interlocking element is a lip having a thickness; (b) the stand-off including the second interlocking element defines an upper diameter greater than 40 mm; and (c) the second interlocking element comprises a groove having a width at least one-fourth the upper diameter and at least twice the thickness of the lip. .Iaddend..Iadd.22.
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