The fluidized product then passes between contact surfaces 2 following {HEAD ~ passage} through {TAIL ~ a brief clearance} between leftmost weir 13 and the leftmost edge of contact surfaces 2 
through
The fluidized product then passes between contact surfaces 2 following { HEAD ~ passage } through { TAIL ~ a brief clearance } between leftmost weir 13 and the leftmost edge of contact surfaces 2
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH