{HEAD ~ Compressed hydrate forming gas} is combined in a pipe with {TAIL ~ the liquid water} under locally supercooled conditions 
is combined with
{ HEAD ~ Compressed hydrate forming gas } is combined in a pipe with { TAIL ~ the liquid water } under locally supercooled conditions
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH