For example, a topology service may be implemented within {HEAD ~ a virtual computing environment}, which may in turn include {TAIL ~ virtual computing instances} 
include
For example , a topology service may be implemented within { HEAD ~ a virtual computing environment } , which may in turn include { TAIL ~ virtual computing instances }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL