{HEAD ~ a plurality} of {TAIL ~ sockets} each connected to an associated one of the first pipes 
of
{ HEAD ~ a plurality } of { TAIL ~ sockets } each connected to an associated one of the first pipes
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH