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