{TAIL ~ Each second planar surface} extends upwardly from the first surface and outwardly with respect to the opening and contacts {HEAD ~ both} of the first planar surfaces 47, 48 
{ TAIL ~ Each second planar surface } extends upwardly from the first surface and outwardly with respect to the opening and contacts { HEAD ~ both } of the first planar surfaces 47 , 48
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH