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