{HEAD ~ said third plane} of said lower surface of said clasp lower part being parallel to {TAIL ~ said second plane} of said edges of said open underside of said clasp upper part ; and 
{ HEAD ~ said third plane } of said lower surface of said clasp lower part being parallel to { TAIL ~ said second plane } of said edges of said open underside of said clasp upper part ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH