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UI
Pixel
Blueberry
Check
YellowGreen
32x32
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Windows 8 Pack (Metro Style)
Check, Book
DarkSlateGray
26x26
Sketchdock Ecommerce Icons
green, tick, Check
24x24
Cologne
LightSkyBlue
Munich
DarkOrange
Fugue Icons
Check, ok, Accept
RoyalBlue
16x16
Boxes, ui, series
Gray
Check, ui, Boxes
Johaupt Free Icons 01
doctor, Check
BurlyWood
Gainsboro
18x18
Silver
ForestGreen
PC 100 Icon Pack
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Super Simple Grey Series
Black
64x64
mail, Check
DarkGray
Check, Error, spell
DarkRed
spell, Check
Green
tick, Circle, ok
tick, shield, ok
ok, Check, tick
Check, Mix, ui
ui, Box, Check
BWPX
Check, bullet
success, ok, yes