The cache processing section performs {HEAD ~ a cache process} composed of two stage processes, a query process and {TAIL ~ a subsequent process}  
composed of
The cache processing section performs { HEAD ~ a cache process } composed of two stage processes , a query process and { TAIL ~ a subsequent process }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH