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while(IN){

while( <IN> ) {

Bareword found in conditional at yourscript.pl line xx.
Name "main::IN" used only once: possible typo at yourscript.pl line xx
+.

Bareword "IN" not allowed while "strict subs" in use at yourscript.pl 
+line xx.
Execution of yourscript.pl aborted due to compilation errors.

use strict;
use warnings;