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2. Add additional derived data as needed for the analysis. The second step consists of adding derived rows and columns based on the initial set of ADaM dataset records and columns. The rules below govern this step. These rules are further described and illustrated in the remaining subsections of this section.

The intent is to use the standard columns as much as possible, to keep the structure as standard as possible, and avoid undue "horizontalization," while still permitting efficient use of function columns.