For such applications, {TAIL ~ the goal} is to establish {HEAD ~ correctness} of programs of the form U1 n 1 ∥ . . . ∥Um n m irrespective of the program size as measured by the number ni of threads executing the code for driver Ui 
For such applications , { TAIL ~ the goal } is to establish { HEAD ~ correctness } of programs of the form U1 n 1 ∥ . . . ∥Um n m irrespective of the program size as measured by the number ni of threads executing the code for driver Ui
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH