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+import java.util.*;%0A%0Apublic class Renovation%0A%7B%0A    public Renovation (boolean debug)%0A    %7B%0A        _debug = debug;%0A    %7D%0A%0A    public Vector%3CCoordinate%3E getBlackTiles (Vector%3CString%3E lines)%0A    %7B%0A        Vector%3CCoordinate%3E blackTiles = new Vector%3CCoordinate%3E();%0A%0A        for (int i = 0; i %3C lines.size(); i++)%0A        %7B%0A            Coordinate coord = tilePosition(lines.elementAt(i));%0A%0A            if (!blackTiles.contains(coord))%0A                blackTiles.add(coord);%0A            else%0A                blackTiles.remove(coord);%0A        %7D%0A%0A        return blackTiles;%0A    %7D%0A%0A    private Coordinate tilePosition (String line)%0A    %7B%0A        return null;%0A    %7D%0A%0A    private boolean _debug;%0A%7D

Update Renovation.java