public Enumerable<Object[]> scan(DataContext root) {

    final Random random = seed >= 0 ? new Random(seed) : new Random();

    final Maze maze = new Maze(width, height);

    final PrintWriter pw = new PrintWriter(System.out);

    maze.layout(random, pw);

    if (Maze.DEBUG) {

      maze.print(pw, true);

    }

    return new AbstractEnumerable<Object[]>() {

      public Enumerator<Object[]> enumerator() {

        final Set<Integer> solutionSet;

        if (solution) {

          solutionSet = maze.solve(0, 0);

        } else {

          solutionSet = null;

        }

        return Linq4j.transform(maze.enumerator(solutionSet),

            new Function1<String, Object[]>() {

              public Object[] apply(String s) {

                return new Object[] {s};

              }

            });

      }

    };

  }