{HEAD ~ The programmable device} is programmed to include {TAIL ~ four processing engines}, each of which performs a single MD5 stage having four MD5 operations performed by the MD5 stage 
is programmed to include
{ HEAD ~ The programmable device } is programmed to include { TAIL ~ four processing engines } , each of which performs a single MD5 stage having four MD5 operations performed by the MD5 stage
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH