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  \code{\link{names}},
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  \code{\link{names}},
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  \code{\link{character}},
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  \code{\link{character}},
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  \code{\link{data.frame}}.
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  \code{\link{data.frame}}.
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}
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}
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\examples{
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\examples{
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make.names(c("a and b", "a-and-b"), unique=TRUE)
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make.names(c("a and b", "a-and-b"), unique = TRUE)
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# "a.and.b"  "a.and.b.1"
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# "a.and.b"  "a.and.b.1"
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make.names(c("a and b", "a_and_b"), unique=TRUE)
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make.names(c("a and b", "a_and_b"), unique = TRUE)
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# "a.and.b"  "a_and_b"
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# "a.and.b"  "a_and_b"
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make.names(c("a and b", "a_and_b"), unique=TRUE, allow_=FALSE)
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make.names(c("a and b", "a_and_b"), unique = TRUE, allow_ = FALSE)
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# "a.and.b"  "a.and.b.1"
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# "a.and.b"  "a.and.b.1"
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state.name[make.names(state.name) != state.name] # those 10 with a space
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state.name[make.names(state.name) != state.name] # those 10 with a space
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}
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}
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\keyword{character}
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\keyword{character}