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Signs
Flat
Ecology
Energy, Alert, power
SandyBrown
512x512
Music
Education
music, Alert, Alarm
Black
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Christmas
musical instrument, Tools And Utensils, Music And Multimedia
User interface
Goldenrod
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Tools And Utensils, Music And Multimedia, Alert
Factory
Alert, warning, exclamation
Gray
Thanksgiving
Khaki
Alert, Alarm, bell
Web
danger, signs, Shapes And Symbols
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Musical instruments
Gold
Biochemistry
signs, Signaling, nuclear
Laboratory set
Lab elements
Resting Elements
bell, musical instrument, Tools And Utensils
Weapons
DarkSlateGray