Such jelly like filler should have a viscosity sufficiently low to be easily introduced into the buffer tubes during the manufacturing process and to allow {HEAD ~ a substantially free relative movement} of {TAIL ~ the fibers} inside the tube 
of
Such jelly like filler should have a viscosity sufficiently low to be easily introduced into the buffer tubes during the manufacturing process and to allow { HEAD ~ a substantially free relative movement } of { TAIL ~ the fibers } inside the tube
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH