Thereby, the paint remaining in {TAIL ~ the paint line} is pushed back into {HEAD ~ the paint supply container} 
Thereby , the paint remaining in { TAIL ~ the paint line } is pushed back into { HEAD ~ the paint supply container }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD