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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def instantiate(self, parallel_envs, seed=0, preset='default') -> VecEnv: """ Create vectorized environments """

        envs = DummyVecEnv([self._creation_function(i, seed, preset) for i in range(parallel_envs)])

        if self.frame_history is not None:
            envs = VecFrameStack(envs, self.frame_history)

        return envs