#' @references
#'
#' **Data originated from:**
#'
#' - OpenPsychometrics. (2012). *Experimental matrix reasoning iq test*.
#' <https://openpsychometrics.org/_rawdata/IQ1.zip>
#'
#' **Data used in:**
#'
#' - Chen, Y., Culpepper, S. A., & Liang, F. (2020). A sparse latent class model
#' for cognitive diagnosis. *Psychometrika*, 1–33.
#' \doi{10.1007/s11336-019-09693-2}
#'
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