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How do Otello and Iago swear their alliance at the end of Act II?

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At the end of Act II of Giuseppe Verdi's opera Otello, the two characters solidify their dark pact through a shared oath of vengeance and loyalty. After Iago provides his fabricated "proofs" of Desdemona's infidelity—specifically mentioning a dream he claims Cassio had and the handkerchief Otello once gave to his wife—Otello reaches a state of uncontrollable rage. In this climactic moment, Otello swears vengeance against his wife and Cassio, while Iago swears fealty to him.1