{HEAD ~ These one more internal features} can be formed singly or concurrently by {TAIL ~ use} of the single molding tool 
formed concurrently by
{ HEAD ~ These one more internal features } can be formed singly or concurrently by { TAIL ~ use } of the single molding tool
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH