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Photography & graphic design
3D
32x32 Free Design Icons
Circle
Black
32x32
Education & science
Pretty Office 10
Circle, ruler, Semi
512x512
Business & finance
Refresh CL
mypictures, Orange, Circle
256x256
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Desktop apps
Free Applications Icons
Circle, renew, turn
24x24
Computer & hardware
Human o2
Circle, here, start
128x128