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Text File  |  1993-02-17  |  246b  |  21 lines
  1. door(a,b).
  2. door(b,e).
  3. door(b,c).
  4. door(d,e).
  5. door(c,d).
  6. door(e,f).
  7. door(g,e).
  8.  
  9. has_phone(g).
  10.  
  11. go(X,X,_,[]).
  12. go(X,Y,T,[Z|R]):-
  13.     Y\==X,
  14.     (door(X,Z) ; door(Z,X)),
  15.     not member(Z,T),
  16.     go(Z,Y,[Z|T],R).
  17.  
  18. member(X,[X|_]).
  19. member(X,[_|R]) :- member(X,R).
  20.  
  21.