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