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UI
3D
Glaze
send, mail, green
DimGray
64x64
Business & finance
SEM Labs
send, Message, mail
DarkGray
48x48
mail, Forward, send
Mixed
Isoglass
push, def, send
Black
Nuvola
send, mail
DarkSlateBlue
Crystal Clear
mail, send
Gainsboro
32x32
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Khaki
22x22
send, Backward
Gold
20x20