sicp-ex-4.65



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meteorgan

  
  
  
 That's because there are four middle-manager  whose manager is Warbucks Oliver. 

To add more detail:

Because Warbucks supervises: 1. Scrooge who supvervises Cratchet 2. Bitdiddle who supervises Hacker 3. Bitdiddle who supervises Fect 4. Bitdiddle who supervises Tweakit

Each path is taken and is reported as a separate case.