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