#' @importFrom tibble tibble
#' @keywords internal
#' cidata: A Data Package for Causal Inference by Hernán and Robins
#'
#' cidata includes 4 data sets:
#'
#' * nhefs
#' * nhefs_complete
#' * nhefs_codebook
#' * greek_data
#'
#' @docType package
#' @name cidata
"_PACKAGE"
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