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      \option{--verbose}.}
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      \option{--verbose}.}
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    \item{\code{warn}:}{sets the handling of warning messages.  If
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    \item{\code{warn}:}{sets the handling of warning messages.  If
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      \code{warn} is negative all warnings are ignored.  If \code{warn}
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      \code{warn} is negative all warnings are ignored.  If \code{warn}
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      is zero (the default) warnings are stored until the top--level
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      is zero (the default) warnings are stored until the top--level
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      function returns.  If fewer than 10 warnings were signalled they
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      function returns.  If 10 or fewer warnings were signalled they
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      will be printed otherwise a message saying how many were
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      will be printed otherwise a message saying how many were
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      signalled.  An object called \code{last.warning} is
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      signalled.  An object called \code{last.warning} is
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      created and can be printed through the function
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      created and can be printed through the function
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      \code{\link{warnings}}.  If \code{warn} is one, warnings are
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      \code{\link{warnings}}.  If \code{warn} is one, warnings are
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      printed as they occur.  If \code{warn} is two or larger all
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      printed as they occur.  If \code{warn} is two or larger all