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function setup() {
createCanvas(windowWidth, windowHeight);
background(0);
}
var x=10,y=10
function draw() {
var w=random(30,80)
fill(150+random(55),10,10)
if(frameCount%7<3){
fill(255)
w=10
}
rect(x,y,w,20)
x+=w+10
if(x>width){
x=0
y+=30
}
}