fork download 
  1. road(durango,redville).
  2. road(redville,durango).
  3. road(redville,hardwick).
  4. road(hardwick,redville).
  5. road(hardwick,newton).
  6. road(newton,hardwick).
  7. road(newton,burr).
  8. road(burr,newton).
  9. road(newton,hallsburg).
  10. road(hallsburg,newton).
  11. road(newton,burlington).
  12. road(burlington,newton).
  13. road(hallsburg,burlington).
  14. road(burlington,hallsburg).
Success #stdin #stdout 0.02s 6204KB
comments (?)
stdin 
road(burr, First), road(First, Second), Second \= burr, format('~w can be visited in two hops from burr through ~w.\n', [Second, First]), fail.
stdout 
hardwick can be visited in two hops from burr through newton.
hallsburg can be visited in two hops from burr through newton.
burlington can be visited in two hops from burr through newton.
https://ideone.com/CRgZi
language:
Prolog (swi 7.6.4)
created:
14 years ago
visibility:
public

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