The computer program product 18, wherein {HEAD ~ the persistent federated folder} contains members from {TAIL ~ an entity} of the persistent federated folder 
The computer program product 18 , wherein { HEAD ~ the persistent federated folder } contains members from { TAIL ~ an entity } of the persistent federated folder
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH