Such control units select {HEAD ~ various modes} of operation, which may include {TAIL ~ heating}, ventilation, maximum air conditioning, normal air conditioning, windshield defogging or defrosting, use of floor, panel and windshield air outlets, recirculation of inside air, intake of outside air, and OFF, for example 
Such control units select { HEAD ~ various modes } of operation , which may include { TAIL ~ heating } , ventilation , maximum air conditioning , normal air conditioning , windshield defogging or defrosting , use of floor , panel and windshield air outlets , recirculation of inside air , intake of outside air , and OFF , for example
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH