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Education & science
3D
Pretty Office 10
scroll, Certificate
Black
512x512
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Mixed
Soft media icons vol 2
Certificate
DarkGray
33x33
UI
Gnome Web Icons
Application, Gnome, Certificate
Gray
32x32
Certificate, 48, Gnome
48x48
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Certificate, tag, 64
64x64
Impressions
Certificate, mail, Safe
400x400
Computer & hardware
Discovery