It also accomplishes {HEAD ~ this result} without the excessive expense of water treatment which has previously made {TAIL ~ such proposed use} of superposed turbines impractical for continuous duty at such high pressures 
It also accomplishes { HEAD ~ this result } without the excessive expense of water treatment which has previously made { TAIL ~ such proposed use } of superposed turbines impractical for continuous duty at such high pressures
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH