Next {TAIL ~ the body} is disposed within the cavity such that {HEAD ~ the inner layer} contacts the body in a first position 
Next { TAIL ~ the body } is disposed within the cavity such that { HEAD ~ the inner layer } contacts the body in a first position
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH