dcngmbh / moox_core

		$counter = array();

		$backup = null;

		foreach($this->numerator as $atomicUnit){

			if( !$backup ){

				$backup = $atomicUnit;

			}

			$counter[$atomicUnit] = ( isset($counter[$atomicUnit]) ? $counter[$atomicUnit] : 0) + 1;

		}

		foreach($this->denominator as $atomicUnit){

			if( !$backup ){

			$counter[$atomicUnit] = ( isset($counter[$atomicUnit]) ? $counter[$atomicUnit] : 0) + 1;

		}

		foreach($this->denominator as $atomicUnit){

			if( !$backup ){

				$backup = $atomicUnit;

			}

			$counter[$atomicUnit] = ( isset($counter[$atomicUnit]) ? $counter[$atomicUnit] : 0) - 1;

		}

		$this->numerator = array();

		$this->denominator = array();