fork download
copy 
  1. % road(X,Y): city X is connected to city Y by a road
  2. road(durango,redville).
  3. road(redville,durango).
  4. road(redville,hardwick).
  5. road(hardwick,redville).
  6. road(hardwick,newton).
  7. road(newton,hardwick).
  8. road(newton,burr).
  9. road(burr,newton).
  10. road(newton,hallsburg).
  11. road(hallsburg,newton).
  12. road(newton,burlington).
  13. road(burlington,newton).
  14. road(hallsburg,burlington).
  15. road(burlington,hallsburg).
Success #stdin #stdout 0.02s 6204KB
comments (?)
stdin
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road(burlington, X), road(X, Y), road(Y, H), format('You can get from Burlington to ~w which will get you to ~w and then to ~w in two hops.\n'[X, Y, H]), fail.
stdout
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Standard output is empty
https://ideone.com/kGbn0
language:
Prolog (swi 7.6.4)
created:
14 years ago
visibility:
public

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