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diff --git a/examples/widgets/animation/sub-attaq/states.h b/examples/widgets/animation/sub-attaq/states.h
deleted file mode 100644
index b3651e1c82..0000000000
--- a/examples/widgets/animation/sub-attaq/states.h
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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtCore module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** BSD License Usage
-** Alternatively, you may use this file under the terms of the BSD license
-** as follows:
-**
-** "Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**   * Redistributions of source code must retain the above copyright
-**     notice, this list of conditions and the following disclaimer.
-**   * Redistributions in binary form must reproduce the above copyright
-**     notice, this list of conditions and the following disclaimer in
-**     the documentation and/or other materials provided with the
-**     distribution.
-**   * Neither the name of The Qt Company Ltd nor the names of its
-**     contributors may be used to endorse or promote products derived
-**     from this software without specific prior written permission.
-**
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef STATES_H
-#define STATES_H
-
-//Qt
-#include <QKeyEventTransition>
-#include <QSignalTransition>
-#include <QState>
-
-class GraphicsScene;
-QT_BEGIN_NAMESPACE
-class QStateMachine;
-QT_END_NAMESPACE
-
-class PlayState : public QState
-{
-public:
-    explicit PlayState(GraphicsScene *scene, QState *parent = nullptr);
-    ~PlayState();
-
- protected:
-    void onEntry(QEvent *) override;
-
-private :
-    GraphicsScene *scene;
-    QStateMachine *machine;
-    int currentLevel;
-    int score;
-
-    friend class UpdateScoreState;
-    friend class UpdateScoreTransition;
-    friend class WinTransition;
-    friend class CustomSpaceTransition;
-    friend class WinState;
-    friend class LostState;
-    friend class LevelState;
-};
-
-class LevelState : public QState
-{
-public:
-    LevelState(GraphicsScene *scene, PlayState *game, QState *parent = nullptr);
-protected:
-    void onEntry(QEvent *) override;
-private :
-    void initializeLevel();
-    GraphicsScene *scene;
-    PlayState *game;
-};
-
-class PauseState : public QState
-{
-public:
-    explicit PauseState(GraphicsScene *scene, QState *parent = nullptr);
-
-protected:
-    void onEntry(QEvent *) override;
-    void onExit(QEvent *) override;
-private :
-    GraphicsScene *scene;
-};
-
-class LostState : public QState
-{
-public:
-    LostState(GraphicsScene *scene, PlayState *game, QState *parent = nullptr);
-
-protected:
-    void onEntry(QEvent *) override;
-    void onExit(QEvent *) override;
-private :
-    GraphicsScene *scene;
-    PlayState *game;
-};
-
-class WinState : public QState
-{
-public:
-    WinState(GraphicsScene *scene, PlayState *game, QState *parent = nullptr);
-
-protected:
-    void onEntry(QEvent *) override;
-    void onExit(QEvent *) override;
-private :
-    GraphicsScene *scene;
-    PlayState *game;
-};
-
-class UpdateScoreState : public QState
-{
-public:
-    UpdateScoreState(QState *parent);
-private:
-};
-
-//These transtion is used to update the score
-class UpdateScoreTransition : public QSignalTransition
-{
-public:
-    UpdateScoreTransition(GraphicsScene *scene, PlayState *game, QAbstractState *target);
-protected:
-    bool eventTest(QEvent *event) override;
-private:
-    PlayState *game;
-    GraphicsScene *scene;
-};
-
-//These transtion test if we have won the game
-class WinTransition : public QSignalTransition
-{
-public:
-    WinTransition(GraphicsScene *scene, PlayState *game, QAbstractState *target);
-protected:
-    bool eventTest(QEvent *event) override;
-private:
-    PlayState *game;
-    GraphicsScene *scene;
-};
-
-//These transtion is true if one level has been completed and the player want to continue
- class CustomSpaceTransition : public QKeyEventTransition
-{
-public:
-    CustomSpaceTransition(QWidget *widget, PlayState *game, QEvent::Type type, int key);
-protected:
-    bool eventTest(QEvent *event) override;
-private:
-    PlayState *game;
-};
-
-#endif // STATES_H