{HEAD ~ an air flow passage} through which {TAIL ~ grass cuttings} are discharged from said cutting chamber in a current of air 
{ HEAD ~ an air flow passage } through which { TAIL ~ grass cuttings } are discharged from said cutting chamber in a current of air
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH