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Desktop apps
Smooth
Farm-fresh
Spam
SandyBrown
32x32
UI
Elegant Themes Icons
mail, Spam
DarkGray
48x48
Pixel
Boolean
Spam, mail
NavajoWhite
16x16
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Quartz
Gainsboro
64x64
Computer & hardware
3D
Discovery
Spam, remove, delete
Gnome icons
Spam, Not
Black
Crystal Project
Spam, Filter
256x256
Futurosoft
White
128x128
Function icons