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function setup() {
createCanvas(windowWidth, windowHeight);
background(100);
for(var x=0;x<width;x=x+50){
for(y=0;y<height;y=y+20){
fill(x/4,155,255)
rect(x,y,30,30)
}
for(y=0;y<height;y=y+20){
fill(x/4,100,255)
rect(x,y,50,10)
}
}
}