%% search.pl  -- Section 2.16 of Prolog Tutorial

solve(P) :-
      start(Start),
      search(Start,[Start],Q),
      reverse(Q,P).

search(S,P,P) :- goal(S), !.         /* done                  */
search(S,Visited,P) :-
     next_state(S,Nxt),              /* generate next state   */
     safe_state(Nxt),                /* check safety          */
     no_loop(Nxt,Visited),           /* check for loop        */
     search(Nxt,[Nxt|Visited],P).    /* continue searching... */

no_loop(Nxt,Visited) :-
      \+member(Nxt,Visited).                   

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