This unit will have a fan to force air into the hat so that {HEAD ~ the person} would not need to use {TAIL ~ energy} to suction the air 
This unit will have a fan to force air into the hat so that { HEAD ~ the person } would not need to use { TAIL ~ energy } to suction the air
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH