By way of example, {HEAD ~ this polishing step} may be accomplished by means of {TAIL ~ chemical mechanical polishing} 
By way of example , { HEAD ~ this polishing step } may be accomplished by means of { TAIL ~ chemical mechanical polishing }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL