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