When {TAIL ~ the flowing oil} meets {HEAD ~ the outlet} 132, the oil drops through the outlet 132 
When { TAIL ~ the flowing oil } meets { HEAD ~ the outlet } 132 , the oil drops through the outlet 132
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH