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