Replying to a message of James Vahn to Ed Beroset:
 >> It sounds to me like you're describing a sliding window on a
 >> circular buffer.  
 JV> Yes, thanks for the eye opener. We've established that
 JV> buffers can be circular, stacks, queues, and data
 JV> structures. Any others come  to mind?  
Geopolitical zones, usually one or more puppet states to eat up an invading 
enemy before it gets to the Motherland (qv. NATO, Warsaw Pact)
:)
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