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