{HEAD ~ This disclosure} pertains to {TAIL ~ machinery} for expanding and inserting empty flexible bags into an open carton 
pertains to
{ HEAD ~ This disclosure } pertains to { TAIL ~ machinery } for expanding and inserting empty flexible bags into an open carton
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH