old_contents: from gym.envs.toy_text.blackjack import BlackjackEnv
  from gym.envs.toy_text.roulette import RouletteEnv
  from gym.envs.toy_text.frozen_lake import FrozenLakeEnv
  from gym.envs.toy_text.nchain import NChainEnv
  from gym.envs.toy_text.hotter_colder import HotterColder
  from gym.envs.toy_text.guessing_game import GuessingGame
  from gym.envs.toy_text.kellycoinflip import KellyCoinflipEnv
  from gym.envs.toy_text.kellycoinflip import KellyCoinflipGeneralizedEnv
  from gym.envs.toy_text.cliffwalking import CliffWalkingEnv
new_contents: from gym.envs.toy_text.blackjack import BlackjackEnv
  from gym.envs.toy_text.roulette import RouletteEnv
  from gym.envs.toy_text.frozen_lake import FrozenLakeEnv
  from gym.envs.toy_text.nchain import NChainEnv
  from gym.envs.toy_text.hotter_colder import HotterColder
  from gym.envs.toy_text.guessing_game import GuessingGame
  from gym.envs.toy_text.kellycoinflip import KellyCoinflipEnv
  from gym.envs.toy_text.kellycoinflip import KellyCoinflipGeneralizedEnv
  from gym.envs.toy_text.cliffwalking import CliffWalkingEnv
  
subject: add new line at end of file for toy_text __init__