Question: what has oedipus already done?
Answer: The step that Oedipus has already taken to deal with the problem is he sent his brother-in-law, Creon, to the shrine to try to learn what to do. According to Creon, what did Apollo say must be done in order to cure Thebes of its pollution? ... Oedipus is resolved to find the murderer of Laius and banish or kill him.