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let leftOn=false
function setup() {
createCanvas(400, 400);
}
function draw() {
background(220);
if(leftOn){
fill("red");
}
rect(0,0,width/3,height)
fill("white");
rect(width/3,0,width/3,height)
rect(2*width/3,0,width/3,height)
}
function mousePressed(){
if (mouseX<width/3){
leftOn=!leftOn
}
}