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use strict;
use warnings;
...
  our $add;
  say $add;
}

package Acme::Sample::Counter;

...
  my $self = shift;
  return $$self;
}

my $counter = new Acme::Sample::Counter ();
$counter->count;      # add 1
$counter->count(10);  # add 10
say $counter->read;