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void setup(){
size(500,500);
smooth();
noLoop();
background(0);
}
void draw(){
square(50,50);
square(450,450);
square(250,250);
}
void square(int x, int y) {
rectMode(CENTER);
fill(255,0,0);
rect(x,y,50,50);
fill(0,0,255);
rect(x,y,35,35);
fill(0,255,0);
rect(x,y,15,15);
}