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viscous:sludge,
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organic:sludge,
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biodegradable:solid,
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organic:residue,
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industrial:sludge,
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soft:substance,
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textured:matter,
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organic:matter,
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organic:substance,
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suspended:solid,
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thick:matter,
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agricultural:system,
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wet:sludge,
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fine:matter,
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viscous:substance,
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particulate:matter,
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biological:sludge,
Category Nuances for sewage_sludge:
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textured,
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suspended,
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wet,
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organic,
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biological,
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thick,
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agricultural,
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soft,
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fine,
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industrial,
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viscous,
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biodegradable,
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particulate,
Simple Categories for sewage_sludge: