Answer Posted / mallikarjuna raju

This is an automatic variable of PDV that returns the no of
observations that it has iterated.There are such variables
like _Error_,end=,in=,first.by-variable,last.by-variable,..etc
All these variables will not be displayed in the target output.
Ex:
Data new;
set <existed>;
if _n_>=2 and <=6 then output;

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