size(500,400);
background(255);
noStroke();

int rectW = 100;
int rectH = 200;

for(int x = 0; x < width; x += rectW) {
  for(int y = 0; y < height; y += rectH) {
    // Add a single debug statement here using println
    // that prints the current x and y coordinates in a 
    // readable fashion
    fill(color(random(256)));
    rect(x, y, rectW, rectH);
  }
}