Final answer:
The subject matter of the story "Exhalation" is the nature of the soul.
Step-by-step explanation:
The subject matter of the story "Exhalation" is the nature of the soul. In the story, the author explores deep philosophical questions about consciousness, identity, and free will. Through the perspective of an artificial being, the story examines the complexities of self-awareness and the impact of knowledge on our understanding of ourselves and the world.
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