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var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "darkgreen";
pincel.fillRect(200,50,350,300);
pincel.fillStyle = "black",
pincel.fillRect(250,110,90,90);
pincel.fillRect(410,110,90,90);
pincel.fillRect(340,200,70,100);
pincel.fillRect(300,240,40,110);
pincel.fillRect(410,240,40,110);
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