#' hello_world
#'
#' The typical hello world example. Demonstrates also how to name functions and
#' the effect of family.
#'
#' @return character a string; default is 'Hello, world!'
#' @author Reinhard Simon
#' @family example
#' @example inst/examples/ex_hello.R
#' @export
hello_world <- function() {
hello()
}
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