{HEAD ~ The buffer element} has {TAIL ~ a lateral side}, as well as a first edge and a second edge disposed oppositely to each other 
{ HEAD ~ The buffer element } has { TAIL ~ a lateral side } , as well as a first edge and a second edge disposed oppositely to each other
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH