A plurality of cylinders received in said well supporting {HEAD ~ a frame structure} comprised of {TAIL ~ a plurality} of channel member positions to be received in said canals 
comprised of
A plurality of cylinders received in said well supporting { HEAD ~ a frame structure } comprised of { TAIL ~ a plurality } of channel member positions to be received in said canals
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH