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The previous conversations all take place via the ansible, or through some version of its technology so that real-time conversations can take place across a vast distance. They involve various people who make decisions regarding Ender's training program particularly Graff.
In the final chapter, there is no longer anyone governing Ender's future or deciding on it and the conversation with Graff is one in the present, the physical present, so there is no longer any need for the representation of it the way it was in earlier chapters.
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