input: Write a function to generate a random number between 0 and 9 that is divisible by 3.
  
  assert generate_random_divisible_number() in {0, 3, 6, 9}
  assert generate_random_divisible_number() in {0, 3, 6, 9}
  assert generate_random_divisible_number() in {0, 3, 6, 9}
output: import random
  
  def generate_random_divisible_number():
      return random.choice([0, 3, 6, 9])