In this case, as mentioned above, {HEAD ~ the effective part} can be cut with a high precision along {TAIL ~ the line} to cut while using the modified region as a starting point for cutting as mentioned above 
In this case , as mentioned above , { HEAD ~ the effective part } can be cut with a high precision along { TAIL ~ the line } to cut while using the modified region as a starting point for cutting as mentioned above
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH