The three phrases that have a strong emotional meaning are: "sweltering with the heat of oppression", "an oasis of freedom", and "vicious racists".
Phrases that have an emotional meaning can be identified in various ways. In the case of Martin Luther King's speech, these phrases stand out because of the emotion he has at the moment of saying them and how they relate to the reality of the African American population.
According to the above, it can be inferred that the sentences with the greatest emotional meaning are:
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