{HEAD ~ The chamber} 150 also includes {TAIL ~ a wall portion} that is disposed along a direction that is substantially perpendicular to the direction of channel wall 145 
includes
{ HEAD ~ The chamber } 150 also includes { TAIL ~ a wall portion } that is disposed along a direction that is substantially perpendicular to the direction of channel wall 145
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH