The Rich Boolean objects IsSubsetOf, IsMultiSubsetOf, and IsOrderedSubsetOf check whether the first range is a subset of the second. The Rich Boolean AllUnique checks whether all elements in a range are unique. The Rich Boolean AllPairs is a generalization of this. rbDOESNT_EXIST, rbFILE_EXISTS, and rbDIRECTORY_EXISTS check whether a file or directory exists or not. rbFILE and rbDIRECTORY check whether a file or directory has certain properties.