A camera mountable arm includes {TAIL ~ a first segment}, a second segment, and {HEAD ~ a third segment} 
A camera mountable arm includes { TAIL ~ a first segment } , a second segment , and { HEAD ~ a third segment }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD