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