{HEAD ~ A cartridge} containing {TAIL ~ a biologically compatible compressed gas} may be attached to the pressure supply conduit 
containing
{ HEAD ~ A cartridge } containing { TAIL ~ a biologically compatible compressed gas } may be attached to the pressure supply conduit
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH