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function setup() {
createCanvas(600, 600);
}
function draw() {
background(100);
if(mouseX<300){
fill(0, 0, 255)
rect(0,0,200,600)
fill(100, 0, 100)
rect(200,0,200,600)
fill(50, 0, 100)
rect(400,0,200,600)}
if(mouseX>300){
fill(255, 0, 0)
rect(0,0,200,600)
fill(150, 50, 50)
rect(200,0,200,600)
fill(255, 100, 100)
rect(400,0,200,600)}
}