{HEAD ~ The opening} includes {TAIL ~ a cylindrical recess} and four tapered slits extending from the base of the recess to a point shaped opening at the other side of said valve body 
{ HEAD ~ The opening } includes { TAIL ~ a cylindrical recess } and four tapered slits extending from the base of the recess to a point shaped opening at the other side of said valve body
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 OTH OTH OTH OTH OTH OTH OTH OTH