In some cases, {HEAD ~ some} of {TAIL ~ the functions} or modes may be omitted, particularly the air conditioning functions 
of
In some cases , { HEAD ~ some } of { TAIL ~ the functions } or modes may be omitted , particularly the air conditioning functions
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH