d) available energy consuming means for transferring a fluid property from {HEAD ~ said first fluid stream} to said {TAIL ~ second fluid stream}; and 
d ) available energy consuming means for transferring a fluid property from { HEAD ~ said first fluid stream } to said { TAIL ~ second fluid stream } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH