The method comprises {HEAD ~ the use} of an extrusion die with primary and secondary feed holes and associated discharge slots, wherein extruded material exits {TAIL ~ the primary discharge slots} at a faster rate than the secondary discharge slots 
The method comprises { HEAD ~ the use } of an extrusion die with primary and secondary feed holes and associated discharge slots , wherein extruded material exits { TAIL ~ the primary discharge slots } at a faster rate than the secondary discharge slots
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