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function setup() { createCanvas(400, 400);}function draw() { background(220); for (let x = 0; x < width; x += 20) { if (mouseX > x && mouseX < x + 20) { if ((x / 20) % 2 === 0) { fill("blue"); //even color } else { fill("red"); } } else { fill("white"); } rect(x, 0, 20, height); }}