A frame support structure is automatically positioned to {HEAD ~ a frame} receiving {TAIL ~ position} where the frame is placed thereon 
receiving
A frame support structure is automatically positioned to { HEAD ~ a frame } receiving { TAIL ~ position } where the frame is placed thereon
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH