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#!/bin/perl
use v5.12;
...
       if (! open $out_fh, '>', $out) {
          die "Can't write '$out': $!";
          }

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Global symbol "$in_fh" requires explicit package name at ./exer_9_2 li
+ne 14.
Global symbol "$out_fh" requires explicit package name at ./exer_9_2 l
+ine 1