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  expected to return a character vector of length 1.
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  expected to return a character vector of length 1.
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  \code{isa} tests whether \code{x} is an object of class(es) as given
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  \code{isa} tests whether \code{x} is an object of class(es) as given
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  in \code{what} by using \code{\link[methods]{is}} if \code{x} is an S4
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  in \code{what} by using \code{\link[methods]{is}} if \code{x} is an S4
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  object, and otherwise giving \code{TRUE} iff \emph{all} elements of
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  object, and otherwise giving \code{TRUE} iff \emph{all} elements of
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  \code{class(x)} are contained in \code{what}.
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  \code{what} are contained in \code{class(x)}.
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  All but \code{inherits} and \code{isa} are \link{primitive} functions.
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  All but \code{inherits} and \code{isa} are \link{primitive} functions.
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}
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}
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\note{
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\note{