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Text File  |  1991-03-05  |  163b  |  6 lines
  1. incompatible(fresh_water(Fish),brackish_water(Fish)).
  2. fresh_water(X) := cichlid(X).
  3. brackish_water(X) := etropline(X).
  4. cichlid(my_fish).
  5. etropline(my_fish).
  6.