1. Round top?
   yes - go to 2
   no => F
2. Long face?
   yes - go to 3
   no - go to 4
3. Horns?
   yes => G
   no - go to 5
4. Flat face?
   yes => D
   no => H
5. One eye?
   yes - go to 6
   no - go to 7
6. Hair?
   yes => J
   no => C
7. White skin?
   yes - go to 8
   no => A
8. Orange eyes?
   yes - go to 9
   no => B
9. Ears?
   yes => E
   no => I

Note:

• Keys should be unique to a clade;
  e.g. orange eyes should occur only within long face.
• Keys should not be repeated;
  e.g. long face should not be asked twice

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