DATA LIST: a list which gives the names of all of the variables represented by the data, in the order that they occur, and information about which column(s) each variable occupies
VARIABLE LABELS: (optional) variable labels should not be confused with the variable names specified on the DATA LIST
VALUE LABELS: (optional) value labels for some or all of the values for each variable
MISSING VALUE: information about which value, if any, represents missing data for each variable
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