@@ -0,0 +1,396 @@
+public class TileId%0A%7B%0A    public static final char BUG = '#';%0A    public static final char EMPTY_SPACE = '.';%0A    public static final char NESTED_GRID = '?';%0A%0A    public static boolean valid (char check)%0A    %7B%0A        if ((check == BUG) %7C%7C (check == EMPTY_SPACE) %7C%7C (check == NESTED_GRID))%0A            return true;%0A        else%0A            return false;%0A    %7D%0A%0A    private TileId ()%0A    %7B%0A    %7D%0A%7D

Create CubeId.java