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}
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}
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\details{
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\details{
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  \code{substring} is compatible with S, with \code{first} and
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  \code{substring} is compatible with S, with \code{first} and
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  \code{last} instead of \code{start} and \code{stop}.
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  \code{last} instead of \code{start} and \code{stop}.
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  For vector arguments, it expands the arguments cyclically to the
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  For vector arguments, it expands the arguments cyclically to the
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  length of the longest.
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  length of the longest \emph{provided} none are of zero length.
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  When extracting, if \code{start} is larger than the string length then
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  When extracting, if \code{start} is larger than the string length then
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  \code{""} is returned.
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  \code{""} is returned.
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  For the replacement functions, if \code{start} is larger than the
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  For the replacement functions, if \code{start} is larger than the