Subversion Repositories programming

delta(0,a,1).   
delta(0,b,0).
delta(1,a,1).
delta(1,b,2).
delta(2,a,2).
delta(2,b,2).
start(0).
final(2).

parse(L) :- start(S), trans(S,L).


trans(X,[A|B]) :- 
      delta(X,A,Y),   /*  X ---A---> Y */
      write(X),
      write('  '),
      write([A|B]),
      nl,
      trans(Y,B).


trans(X,[]) :- 
      final(X),
      write(X),
      write('  '),
      write([]), nl.