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Nature
Flat
City Elements
Nuclear Plant, landscape, buildings
Black
512x512
nature, Seat, Park
DarkSlateGray
nature, landscape, buildings
Tree, nature, landscape
woods, trees, pines
Health and medical
Anatomy, Skeleton, Bone
DarkSlateBlue
medicine, nature, Skeleton
DimGray
medical, medicine, nature
Sienna
Skeleton, Bone, Bones
Gold
Laboratory set
science, education, nature
nature, Molecule, Biology
science, Alcohol, education
Lab elements
Molecular, science, education
education, nature, Molecule
Universe
miscellaneous, Moon, weather
sun, weather, nature
miscellaneous, nature, space
star, miscellaneous, Shooting Star