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…showed last 75 words of 944 total…we only read about him gaining Cassio in his web I'm sure he might have used other techniques to get the trust of the others. So the techniques that he used were to gain their trust, then branch off that. Another one was that he knew how to cover his tracks, and the last one was that he knew how to use all his options. So Iago accomplished all his tasks with those simple techniques.