{HEAD ~ The cover} defines {TAIL ~ a dispensing orifice} and defines an edge for severing at least part of the membrane as the cover is moved from the outer position to the inwardly displaced position 
{ HEAD ~ The cover } defines { TAIL ~ a dispensing orifice } and defines an edge for severing at least part of the membrane as the cover is moved from the outer position to the inwardly displaced position
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 OTH OTH