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var pantalla = document.querySelector("canvas");
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pincel.fillStyle = "darkgreen";
pincel.fillRect(200,50,350,300);
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pincel.fillRect(250,100,90,90);
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pincel.fillRect(410,100,90,90);
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pincel.fillRect(340,190,70,100);
pincel.fillStyle = "black";
pincel.fillRect(300,250,40,100);
pincel.fillStyle = "";
pincel.fillRect(410,250,40,100);
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