Category Nuances for null:

• basic,
• key,
• industrial,
• mature,
• domestic,
• conventional,
• intensive,
• big,
• regional,
• visible,
• entire,
• heavy,
• metal,
• agricultural,
• large,
• modern,
• tough,
• technical,
• swedish,

Simple Categories for null:

• industry,
• enterprise,
• system,
• sector,