{TAIL ~ The method} 2, wherein the width of the opening portion of {HEAD ~ the core partition} w is changeable 
{ TAIL ~ The method } 2 , wherein the width of the opening portion of { HEAD ~ the core partition } w is changeable
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH