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package Foo;
use Fergal::MM qw( Bar );

package Foo;
use Fergal::MM qw( Bar );
...
  check($value);
  $self->SUPER::setBar($value);
}

$a->Grid(2, 3) = $player1;
$a->Grid(7, 5) = $player2;

$a->setGrid($player1, 2, 3);
$a->setGrid($player2, 7, 5);