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91.1 | Services furnished by business, employers' and professional organizations
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91.11 | Services furnished by business and employers' organizations
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91.12 | Services furnished by professional organizations
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91.20 | Services furnished by trade unions
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91.3 | Other membership organization services
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91.31 | Religious services
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91.32 | Services furnished by political organizations
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91.33 | Services furnished by other membership organizations n.e.c.
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