| http://www.w3.org/ns/prov#value | - r's code to handle error recovery.tryCatchProvides a mechanism for handling unusual conditions, including errors and warnings.typeofDetermines the (R internal) type of storage mode of anyobject.unclassReturns (a copy of) its argument with its classattribute removed.undebugSets, unsets, or queries the debugging flag on afunction.unionPerforms set union, intersection, (asymmetric!) difference, equal
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