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.\n', Second), fail
stdout 
Standard output is empty
https://ideone.com/sDHkv
language:
Prolog (swi 7.6.4)
created:
14 years ago
visibility:
public

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