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simple:surface,
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inanimate:object,
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analytic:surface,
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geometrical:structure,
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analytical:surface,
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infinite:system,
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regular:filter,
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simple:region,
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conventional:surface,
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geometrical:feature,
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familiar:object,
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concrete:structure,
Category Nuances for flat_surface:
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conventional,
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inanimate,
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familiar,
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analytical,
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regular,
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geometrical,
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infinite,
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analytic,
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concrete,
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simple,
Simple Categories for flat_surface: