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  classes that extend it represent unevaluated objects, as produced for
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  classes that extend it represent unevaluated objects, as produced for
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  example by the parser or by functions such as \code{\link{quote}}.
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  example by the parser or by functions such as \code{\link{quote}}.
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}
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}
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\usage{
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\usage{
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### each of these classes corresponds to an unevaluated object
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### each of these classes corresponds to an unevaluated object
- 
 
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### in the S language.
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### in the S language.  The class name can appear in method signatures,
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### The class name can appear in method signatures,
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### and in a few other contexts (such as some calls to as()).
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### and in a few other contexts (such as some calls to as()).
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"("
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"("
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"<-"
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"<-"
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"call"
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"call"