According to one aspect, {HEAD ~ a multi layered fiber} containing a core, {TAIL ~ a first layer}, and a second layer is provided 
containing
According to one aspect , { HEAD ~ a multi layered fiber } containing a core , { TAIL ~ a first layer } , and a second layer is provided
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH