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Nature
Flat
City Elements
Nuclear Plant, landscape, buildings
Black
512x512
nature, landscape, buildings
Buildings
industry, landscape, buildings
Education
Laboratory set
Oil, petrol, petroleum
Signs
Energy, Alert, power
Lab elements
education, Gas, industry
Weapons
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Business and Office
buildings, Factory, Industrial
DarkSlateGray
Industrial, pollution, Contamination
Goldenrod
Industry
Factory machinery
industry, Factory, robotics
Silver
Industrial Robot, industry, Factory
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Factory, robotics, Industrial Robot