{HEAD ~ No filter program} 340 receive {TAIL ~ program control} as request 325 bypasses any filter program 340 
receive
{ HEAD ~ No filter program } 340 receive { TAIL ~ program control } as request 325 bypasses any filter program 340
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH