filling {HEAD ~ a plurality} of {TAIL ~ elongated tubular flexible plastic bag leg members} and closing off ends thereof after filling thereof 
of
filling { HEAD ~ a plurality } of { TAIL ~ elongated tubular flexible plastic bag leg members } and closing off ends thereof after filling thereof
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH