Answer:
Opposites
Step-by-step explanation:
In this introduction, we learn about the fate of Oedipus. The chorus tells us that Oedipus had great renown, and that no other prince ever achieved such power. We also learn that Oedipus, however, had a tragic life and misfortune. The juxtaposition of these two elements are the main idea that the chorus wants to communicate. The structure that they use, therefore, is one of opposites as an organizing principle.