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The opposite of "Not Necessarily True" would be something that is unequivocally true, meaning it must be true based on the information provided. In the context of logical reasoning on the LSAT, if a statement "must be true," it is a strong claim that is supported by the given premises and is logically required based on the information provided. This contrasts with "Not Necessarily True," which indicates that a statement could potentially be true but is not guaranteed to be so. Therefore, "Must Be True" is the correct opposite of "Not Necessarily True."