anchor.diff:     (say "On the tenth floor.")
      (say "In the bathroom.")
      (say "Working from home.")
  -   (say "Out of the office.")))
  +   (say "Out of the office.")
  +   (say "In Mountain View")
  +   (say "In the 5CC office")
  +   (say "Do I look like Maps?")))
   
   (category ("how * are you" something)
      (reduce "are you *" something))
   
  -(category ("how *")
  +(category ("answer ignorance")
     (randomly
      (say "Very carefully.")
      (say "Beats me.")
      (say "I don't know.")))
   
  +(category ("how *")
  +  (reduce "answer ignorance"))
  +
   (category ("what is your name")
     (say "My name is Orca."))
   
  
positive.code: 
  (category ("are we google yet")
    (reduce "answer positively"))
  
negative.code:   (say "African or European?"))
  
  (category ("what *")
    (say "Do I look like a search engine to you?")
    (reduce "answer ignorance"))
  
  (category ("is *")
    (randomly
  