The system also induces a shut off in the first channel of {HEAD ~ said manifold} for preventing {TAIL ~ a flow} of said first material in said first channel 
for preventing
The system also induces a shut off in the first channel of { HEAD ~ said manifold } for preventing { TAIL ~ a flow } of said first material in said first channel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH