{HEAD ~ a data pattern enforcer} for applying said rules to {TAIL ~ packets} at the adaptor layer; and 
{ HEAD ~ a data pattern enforcer } for applying said rules to { TAIL ~ packets } at the adaptor layer ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH