{HEAD ~ said fourth plane} of said edges of said open top side of said clasp lower part being parallel to {TAIL ~ said first plane} of said upper surface of said clasp upper part  
{ HEAD ~ said fourth plane } of said edges of said open top side of said clasp lower part being parallel to { TAIL ~ said first plane } of said upper surface of said clasp upper part
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH