Therefore, {HEAD ~ the quantity} of grass clippings which directly collide with {TAIL ~ the front wall portion} of the enclosure wall and then fall down, is remarkably reduced, and a good dispersion of grass clippings is ensured 
directly collide with
Therefore , { HEAD ~ the quantity } of grass clippings which directly collide with { TAIL ~ the front wall portion } of the enclosure wall and then fall down , is remarkably reduced , and a good dispersion of grass clippings is ensured
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL 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