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UI
Pixel
Tango
Face, sad
DarkSlateGray
32x32
Avatars & smileys
Smooth
Lin
sad, smiley, Face
Khaki
128x128
Bad, sad, Frown
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Network & communications
Oxygen
Gold
22x22
Function icons
smile, sad
Goldenrod
48x48
Mixed
DRF
sad, smiley