Therefore, the grass can be mown, without leaving {TAIL ~ any uncut grasses}, so as to have {HEAD ~ a good finish} 
Therefore , the grass can be mown , without leaving { TAIL ~ any uncut grasses } , so as to have { HEAD ~ a good finish }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD