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