The apparatus may include {HEAD ~ a single processor} configured to execute {TAIL ~ multiple processes} concurrently, or multiple processing units, each configured to execute one or more processes 
The apparatus may include { HEAD ~ a single processor } configured to execute { TAIL ~ multiple processes } concurrently , or multiple processing units , each configured to execute one or more processes
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH