The aerosol container has {HEAD ~ an aerosol valve} from which the contents exit {TAIL ~ the container} 
The aerosol container has { HEAD ~ an aerosol valve } from which the contents exit { TAIL ~ the container }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL