There can be several introduction gaps or orifices operating at {TAIL ~ one time} to increase {HEAD ~ the total production throughput} 
There can be several introduction gaps or orifices operating at { TAIL ~ one time } to increase { HEAD ~ the total production throughput }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD