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function setup() {
createCanvas(400, 400);
}
function draw() {
background(100);
stroke(0,255,0);
line(0, 0, 400, 400);
line(0, 399, 399, 0);
rectMode(CENTER);
noFill();
stroke(0, 255, 0);
rect(200, 200, 150, 150);
fill(100)
noStroke();
ellipse(200, 200, 100, 100);
}