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UI
Pixel
Fugue Icons
mahjong
Gainsboro
16x16
White, mahjong
player, media
Socket, Minus
switch, Minus
Smooth
Ultimate Gnome
mark, read, mail
256x256
Computer & hardware
3D
Discovery
new, mail
32x32
Files & folders
Rise
music
128x128
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Quartz
Mous
64x64
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Gnome icons
math, Ooo
24x24
Shopping & e-commerce
Credit Cards
Moneybookers
50x50
Human o2
Message, new, messages
menu, user interface, window
Mandvdico
Manview
manager, window
mime, Text, Vcalendar
macro, tools
Message, post
48x48
media, player
Minus, Socket
Mixed
Flavour Extended
Mouse, Mighty
Tango
Message, new, mail