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  \code{\link{attributes}}.
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  \code{\link{attributes}}.
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}
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}
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\examples{
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\examples{
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require(stats)
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require(stats)
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sapply(options(),mode)
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sapply(options(), mode)
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cex3 <- c("NULL", "1", "1:1", "1i", "list(1)", "data.frame(x = 1)",
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cex3 <- c("NULL", "1", "1:1", "1i", "list(1)", "data.frame(x = 1)",
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  "pairlist(pi)", "c", "lm", "formals(lm)[[1]]",  "formals(lm)[[2]]",
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  "pairlist(pi)", "c", "lm", "formals(lm)[[1]]",  "formals(lm)[[2]]",
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  "y ~ x","expression((1))[[1]]", "(y ~ x)[[1]]",
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  "y ~ x","expression((1))[[1]]", "(y ~ x)[[1]]",
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  "expression(x <- pi)[[1]][[1]]")
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  "expression(x <- pi)[[1]][[1]]")