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Text File  |  1991-03-05  |  218b  |  17 lines
  1.  
  2. fresh(Fish):=
  3.         cichlid(Fish).
  4.  
  5. brackish(Fish):=
  6.         etropline(Fish).
  7.  
  8. incompatible(fresh(Fish),brackish(Fish)).
  9.  
  10. cichlid(Fish):-
  11.         etropline(Fish).
  12.  
  13. cichlid(fish).
  14.  
  15. etropline(fish).
  16.  
  17.