#' Example of association file.
#'
#' The data was obtain by random sampling and anonimization of real research
#' data.
#' @name asso.file.tsv.gz
#' @usage data("association_file")
#'
#' @description This file is a simple example of association file. Use it as
#' reference to properly fill out yours.
#' To generate an empty association file to fill see the
#' `generate_blank_association_file()` function.
#' @seealso \code{\link{generate_blank_association_file}}
#' @keywords internal
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#' Example of structured file system with this structure:
#' * fs
#' |-- * PJ01
#' |------ * quantification
#' |----------- * POOL01-1
#' |----------- * POOL02-1
#' |----------- * POOL03-1
#' |----------- * POOL04-1
#' |------ * iss
#' |----------- * POOL01-1
#' |----------- * POOL02-1
#' |----------- * POOL03-1
#' |----------- * POOL04-1
#' Useful for runnable examples.
#' @seealso \code{\link{unzip_file_system}},
#' \code{?integration_matrices}
#' @keywords internal
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