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size (800, 600);
ellipse (500, 300, 500, 500);
ellipse (200, 250, 300, 300);
ellipse (700, 500, 100, 100);
fill (255, 0, 0, 100); //Red Color
ellipse (500, 300, 500, 500); //Red Circle
fill (0, 255, 150 ); //Green Color
ellipse (200, 250, 300, 300); //Green Circle
fill (0, 0, 500); //Blue Color
ellipse (700, 500, 100, 100); //Blue Circle