# For example of each matrix, type the command in R: attributes(realdata_covariates)
# to obtain names of 10 bulit-in matrices in the list:
# "CASEZ_1", "CASEZhat_1", "CASEZ_2", "CASEZhat_2", "CASEZhat_22", "CONTZ_1",
# "CONTZhat_1", "CONTZ_2", "CONTZhat_2", "CONTZhat_22".
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