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OPTION 3: Eteocles defends Thebes against his own brother, proving his loyalty.
Eteocles decision to defend Thebes, his city, even if it meant to be against his brother, who normally represent a close part in someone's life, proves his full devotion and faithfulness to Thebes. It proves his loyalty regardless of tie blood. There aren't many greater actions of loyalty to a nation than when someone put the nation over his or her family.
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