public class Portal extends Tile
{
    public static final String START = "AA";
    public static final String EXIT = "ZZ";

    public Portal (Coordinate position, boolean horizontalRepresentation)
    {
        super(position, TileId.PORTAL);
        
        _location = position;
        _horizontal = horizontalRepresentation;
    }

    private Coordinate _location;
    private boolean _horizontal;
}
@@ -251,38 +251,8 @@
    %0A
-        _location = position;%0A
     
@@ -306,42 +306,8 @@
  %7D%0A%0A
-    private Coordinate _location;%0A
     

Update Portal.java