{HEAD ~ These mechanisms} may include a set of one or more pattern matching masks and {TAIL ~ a count indication} into the packet as to where pattern matching will begin 
{ HEAD ~ These mechanisms } may include a set of one or more pattern matching masks and { TAIL ~ a count indication } into the packet as to where pattern matching will begin
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH