{HEAD ~ The method} 7, wherein the center roller rotates independently of {TAIL ~ the first edge roller} 
{ HEAD ~ The method } 7 , wherein the center roller rotates independently of { TAIL ~ the first edge roller }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL