{HEAD ~ Continuous filament yarns} of {TAIL ~ approximately 20 to 50 filaments} also conveniently are formed 
of
{ HEAD ~ Continuous filament yarns } of { TAIL ~ approximately 20 to 50 filaments } also conveniently are formed
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH