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