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my $var = foo();
...

print $var;

my $var = foo('some_text_for_instance');
...
    return 'bar';
   }

my $var = foo($somevar,"some text",$somehashref);
...
   return $hashref->{'some_key'};
  }

 
sub foo
...
   return $private_local_array[4];
  }