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        <div>いくつかのプロパティ(Rectangle.hoverなど)に対し、ノード(Rectangleノードなど)上の変更リスナーを追加または削除する方法のデモを行うサンプル。リスナーを追加すると、テキスト・フィールドにhoverプロパティの変更が表示されます。</div>
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