#' Negation of the infix \%in\% operator
#'
#' This function is the opposite of the \code{\%in\%} operator.
#' It works the same, and can be used in the same situations.
#' It selects all cases not in another vector. Output is \code{TRUE} or \code{FALSE},
#' never \code{NA}.
#'
#' @name notin
#' @rdname notin
#' @export
"%!in%" <- function(x, y) {
!("%in%"(x, y))
}
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