void setup() {
  size(500,500);
  background(0);
  stroke(0);

}

void draw() {
  rect(0,0,100,250);
  rect(100,250,100,250);
  rect(200,0,100,250);
  rect(300,250,100,250);
  rect(400,0,100,250);

  rect(0,100,500,10);
  rect(0,400,500,10);
  rect(0,245,500,10);

  rect(45,0,10,500);
  rect(445,0,10,500);
  rect(245,0,10,500);

  rect(145,0,10,500);
  rect(345,0,10,500);
}