{HEAD ~ The RA} provides {TAIL ~ a subsystem} with a mechanism for sending read and write requests to the DA of another subsystem 
provides
{ HEAD ~ The RA } provides { TAIL ~ a subsystem } with a mechanism for sending read and write requests to the DA of another subsystem
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH