The first and second elements are capable of being pivoted between the closed condition opposing the upper surface and {HEAD ~ the open condition} splayed away from {TAIL ~ the upper surface} 
splayed away from
The first and second elements are capable of being pivoted between the closed condition opposing the upper surface and { HEAD ~ the open condition } splayed away from { TAIL ~ the upper surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL