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