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  \item{.Force}{ if \code{TRUE}, return \code{NULL} if the class is
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  \item{.Force}{ if \code{TRUE}, return \code{NULL} if the class is
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    undefined; otherwise, an undefined class results in an error.}
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    undefined; otherwise, an undefined class results in an error.}
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  \item{where}{ environment from which to begin the search for the definition; by default,
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  \item{where}{ environment from which to begin the search for the definition; by default,
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    start at the top-level (global) environment and proceed through
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    start at the top-level (global) environment and proceed through
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    the search list.}
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    the search list.}
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  \item{package}{ the name of the package asserted to hold the
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  \item{package}{ the name or environment of the package asserted to hold the
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      definition.  If it is a non-empty string it is used instead of
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      definition.  If it is a non-empty string it is used instead of
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      \code{where}, as the first place to look for the class.
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      \code{where}, as the first place to look for the class.
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      Note that the package must be loaded but need not be attached.  By
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      Note that the package must be loaded but need not be attached.  By
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      default, the package attribute of the \code{Class} argument is
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      default, the package attribute of the \code{Class} argument is
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      used, if any.  There will usually be a package attribute if
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      used, if any.  There will usually be a package attribute if