Clearly, this is important as {HEAD ~ correctness} of a system with {TAIL ~ a fixed number} of threads does not, in general, establish correctness for an arbitrary number 
Clearly , this is important as { HEAD ~ correctness } of a system with { TAIL ~ a fixed number } of threads does not , in general , establish correctness for an arbitrary number
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH