A monitor unit which can monitor {TAIL ~ equivalent operation} of the processing sets can also include {HEAD ~ the mutex ordering mechanism} 
A monitor unit which can monitor { TAIL ~ equivalent operation } of the processing sets can also include { HEAD ~ the mutex ordering mechanism }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD