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function setup() {
createARCanvas(480, 480);
}
function draw() {
background(0,0,255,1); // R,G,B,A
fill(0,255,0);
noStroke();
rect(10,100,200,300); //x,y,h,w
noFill();
strokeWeight(8);
stroke(255,0,0);
ellipse(300,240,240); //x,y,r
}