{HEAD ~ The microcutting device} is sharper than {TAIL ~ a metal blade incision device} and is suitable of mass production 
is sharper than
{ HEAD ~ The microcutting device } is sharper than { TAIL ~ a metal blade incision device } and is suitable of mass production
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH