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}
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}
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\details{
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\details{
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  \code{chartr} translates each character in \code{x} that is specified
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  \code{chartr} translates each character in \code{x} that is specified
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  in \code{old} to the corresponding character specified in \code{new}.
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  in \code{old} to the corresponding character specified in \code{new}.
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  Ranges are supported in the specifications, but character classes and
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  Ranges are supported in the specifications, but character classes and
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  repreated characters are not.  If \code{old} contains more characters
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  repeated characters are not.  If \code{old} contains more characters
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  than new, an error is signaled; if it contains fewer characters, the
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  than new, an error is signaled; if it contains fewer characters, the
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  extra characters at the end of \code{new} are ignored.
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  extra characters at the end of \code{new} are ignored.
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  \code{tolower} and \code{toupper} convert upper-case characters in a
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  \code{tolower} and \code{toupper} convert upper-case characters in a
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  character vector to lower-case, or vice versa.  Non-alphabetic
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  character vector to lower-case, or vice versa.  Non-alphabetic