Nothing
#' Variable frame for a three block model for the CMC data
#'
#' Block dependencies are Block 1 <- Block 2 <- Block 3
#'
#' Block 1 (targets) : contraceptive <-> nrChild
#' Block 2 (intermediate variables): wifeRel <-> solIndex
#' Block 3 (purely explanatory): age
#'
#' @format A 5x3 variable frame
#' @name cmc_prep
NULL
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