As shown, two separating units 1 on the left side of frame 2 hold a stack of insert material while the separating unit 1 on the right holds {HEAD ~ a stack} of {TAIL ~ newspapers} or other material 
of
As shown , two separating units 1 on the left side of frame 2 hold a stack of insert material while the separating unit 1 on the right holds { HEAD ~ a stack } of { TAIL ~ newspapers } or other material
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH