The current liquid level is measured by {TAIL ~ the use} of {HEAD ~ a liquid level sensor} 6, and said maximum amount supplemented is calculated 
The current liquid level is measured by { TAIL ~ the use } of { HEAD ~ a liquid level sensor } 6 , and said maximum amount supplemented is calculated
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH