{HEAD ~ A method} 1, wherein {TAIL ~ the length} of the fiber ends released by the action of said external force is at least 3 mm 
wherein
{ HEAD ~ A method } 1 , wherein { TAIL ~ the length } of the fiber ends released by the action of said external force is at least 3 mm
HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH