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