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#!/usr/bin/perl -w
                                                                      
+          
...
  return 0;
}

my @array1 = [ "A", "B", "C" ];

use strict;
use warnings;
...
          'test4',
          'test4'
        ];

  return 1 if ($y =~ /$x/);      # Swapped $x and $y

my @array2_copy = @array2;
foreach my $item1 (@array1) {
...
        ...
    }
}