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