Given the following dataset: libname results 'c:\cert\output'; data results.output03_1 (drop=n); set cert.input03; n=find(major,'and','i'); if n^=0 then do; second_major=subtr(major,n+4); major=subtr(major,1,n-2); end; run; What do the above bold parts "i" "n+4" and "n-2" mean? Thanks!
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