{TAIL ~ A folder} that is {HEAD ~ a member} of a federated folder can also be a federated folder 
{ TAIL ~ A folder } that is { HEAD ~ a member } of a federated folder can also be a federated folder
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH