c) available energy consuming means for pre mixing {HEAD ~ a portion} of said first fluid stream with {TAIL ~ another portion} of said first fluid stream to form, within said conduit, a premixed first fluid stream generally separate from said second fluid stream 
with
c ) available energy consuming means for pre mixing { HEAD ~ a portion } of said first fluid stream with { TAIL ~ another portion } of said first fluid stream to form , within said conduit , a premixed first fluid stream generally separate from said second fluid stream
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH