The loop yarn can be {HEAD ~ a spun yarn} made by {TAIL ~ any available spinning technique}, or a filament yarn made by extrusion 
made by
The loop yarn can be { HEAD ~ a spun yarn } made by { TAIL ~ any available spinning technique } , or a filament yarn made by extrusion
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH