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  }
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  }
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}
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}
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\arguments{
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\arguments{
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  \item{f}{ The character string naming the function. }
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  \item{f}{ The character string naming the function. }
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  \item{where}{ The environment, name space, or search-list position
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  \item{where}{ The environment, namespace, or search-list position
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  from which to search for objects.  By default, start at the
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  from which to search for objects.  By default, start at the
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  top-level environment of the calling function, typically the global
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  top-level environment of the calling function, typically the global
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  environment (i.e., use the search list), or the name space of a
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  environment (i.e., use the search list), or the namespace of a
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  package from which the call came.  It is important to supply this
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  package from which the call came.  It is important to supply this
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  argument when calling any of these functions indirectly.  With
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  argument when calling any of these functions indirectly.  With
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  package name spaces, the default is likely to be wrong in such calls.}
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  package namespaces, the default is likely to be wrong in such calls.}
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  \item{signature}{ The class signature of the relevant method.  A
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  \item{signature}{ The class signature of the relevant method.  A
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    signature is a named or unnamed vector of character strings.  If
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    signature is a named or unnamed vector of character strings.  If
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    named, the names must be formal argument names for the generic
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    named, the names must be formal argument names for the generic
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    function.  Signatures are matched to the arguments specified in
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    function.  Signatures are matched to the arguments specified in