{HEAD ~ Each logical compartment} includes {TAIL ~ a placement policy} including a set of storage placement rules for placement of storage symbols into a set of physical storage containers 
{ HEAD ~ Each logical compartment } includes { TAIL ~ a placement policy } including a set of storage placement rules for placement of storage symbols into a set of physical storage containers
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH