I echo ysth's comment. Maybe there's a problem opening one of the input files? 
open (IN, "<$first")
or die("Can't open first input file: $!$/");
open (IN2, "<$second")
or die("Can't open second input file: $!$/");
open (OUT, ">NACCESS")
or die("Can't open output file: $!$/");

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In reply to Re^4: hash question by ikegami
in thread hash question by Anonymous Monk

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