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function setup() {
createCanvas(400, 400);
colorMode(HSB);
noStroke();
}
function draw() {
background(220);
for(let i=0;i<18;i++){
let hue=i*360/18;
let x=i*width/18;
fill(hue,100,100);
rect(x,0,width/18,height);
}
}