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Case Lab · Type E · Foundation

F21

Just an unusual hobby

Tomas, 35, is intensely devoted to an unusual hobby — restoring antique typewriters — and can talk about little else at social gatherings, which his coworkers find 'a bit odd' and slightly off-putting. Outside this one enthusiasm, his speech is entirely ordinary, he has no unusual beliefs about the world, no suspiciousness, no perceptual disturbances, and he maintains a long-term relationship and a wide circle of friends who describe him as warm and easy to talk to once you share his interest.

What is the best-supported classification?