{HEAD ~ A portion} of the first and second layers can function as {TAIL ~ a frangible seal} that is configured to be torn away by a user 
function as
{ HEAD ~ A portion } of the first and second layers can function as { TAIL ~ a frangible seal } that is configured to be torn away by a user
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH