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<?php interface Consumer { function consume(Argument $argument); } class ConsumerA implements Consumer { public function consume(Argument $argument) { return $this->_consume($argument); } protected function _consume(ArgumentA $argument) { } } class ConsumerB implements Consumer { public function consume(Argument $argument) { $this->_consume($argument); } protected function _consume(ArgumentB $argument) { } } interface Argument { } class ArgumentA implements Argument { } class ArgumentB implements Argument { }
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