{HEAD ~ Various components} within system 2200 are connected using airway connections and {TAIL ~ electronic/electrical connections}  
are connected using
{ HEAD ~ Various components } within system 2200 are connected using airway connections and { TAIL ~ electronic / electrical connections }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH