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vertical:surface,
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smooth:surface,
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upright:structure,
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solid:obstruction,
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planar:surface,
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simple:structure,
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environmental:barrier,
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architectural:surface,
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supporting:structure,
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planar:structure,
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supporting:surface,
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structural:unit,
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flat:surface,
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geological:formation,
Category Nuances for vertical_wall:
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planar,
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solid,
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simple,
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vertical,
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smooth,
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environmental,
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geological,
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architectural,
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structural,
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supporting,
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flat,
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upright,
Simple Categories for vertical_wall: