code: def main():
      s = Screen()
      s.bgcolor("black")
      p = Turtle()
      p.speed(0)
      p.hideturtle()
      p.pencolor("red")
      p.pensize(3)
  
      s.tracer(36, 0)
  
      at = clock()
      mn_eck(p, 36, 19)
      et = clock()
      z1 = et - at
  
      sleep(1)
  
      at = clock()
      while any(t.undobufferentries() for t in s.turtles()):
          for t in s.turtles():
              t.undo()
      et = clock()
      return "runtime: %.3f sec" % (z1 + et - at)
  
label_desc: Use image node_id 2 for calling a global function with example usage: main() and returns: unknown