What is the function of the double commas (,,) in the code below? data dm6a; set rawdata.dob rawdata.xds(where=(datc^='')); length pendtc $19.; if datc^= '' then do; %dtc(datc,,pendtc); end; else if visdatc ^= '' then do; %dtc(visdatc,,pendtc); end; else do; %dtc(visdatc,,pendtc); end; run;
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