Then, the oil having flowed into {TAIL ~ the horizontal path} 36 flows up along {HEAD ~ the vertical path} 32 
Then , the oil having flowed into { TAIL ~ the horizontal path } 36 flows up along { HEAD ~ the vertical path } 32
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH