int x = 0; // Sets the horizontal position of the lines
int y = 55; // Sets the vertical position of the lines

void setup() {
  size(100, 100); // Sets the window size to 100 x 100 pixels
}

void draw() {
  background(204);
  line(x, y, x+20, y-40); // Left line
  line(x+10, y, x+30, y-40); // Middle line
  line(x+20, y, x+40, y-40); // Right line
  x = x + 1; // Add 1 to x
  if (x > 100) { // If x is greater than 100
    x = -40; // Assign -40 to x
  }
}