The method and {HEAD ~ system} employ {TAIL ~ the technique} of using alternate dispatch variables which can be provided with values naming the alternate objects to which the messages are to be dispatched upon failure of execution at the local object 
employ
The method and { HEAD ~ system } employ { TAIL ~ the technique } of using alternate dispatch variables which can be provided with values naming the alternate objects to which the messages are to be dispatched upon failure of execution at the local object
OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH