Apparatus, methods, and computer program products are disclosed for concurrently searching a memory containing a skiplist data structure. The method includes receiving dimensional input including one or more vehicle level parameters and one or more component level parameters; receiving geometrical input including one or more non-dimensional design inputs; and generating a parametric concept model based on dimensional input and the geometrical input. A head restraint is used to reduce the gross alignment between the optical system and the patient’s pupil. An actuating unit opens a solenoid valve and drains washing water, stored in a pressure chamber of the flush valve, through a drain hose into the toilet, thus disposing of excrement in the toilet using washing water fed from a water supply, according to the result of detection by the sensor. The aspiration aperture can be centered within the cross-port to provide symmetrical deicing heater error behavior of the probe during changes in angle of attack.