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  A call to  \code{\link{selectSuperClasses}(cl)} returns a list of
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  A call to  \code{\link{selectSuperClasses}(cl)} returns a list of
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  superclasses, similarly to
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  superclasses, similarly to
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  \code{extends(cl)}.  Additional arguments restrict the class names
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  \code{extends(cl)}.  Additional arguments restrict the class names
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  returned to direct superclasses and/or to non-virtual classes.
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  returned to direct superclasses and/or to non-virtual classes.
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  Either way, programming with the result, particularly using
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  \code{\link{sapply}}, can be useful.
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  To find superclasses with more generally defined properties, one can program
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  To find superclasses with more generally defined properties, one can program
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  with the result returned by \code{extends} when called with one
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  with the result returned by \code{extends} when called with one
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  class as argument.
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  class as argument.
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  By default, the call returns a character vector including the name of the class
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  By default, the call returns a character vector including the name of the class