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Mixed
Flat
Flat Design Icons (Set 2)
Presentation, teacher, seminar
Lavender
512x512
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Office Vol.2
calculate, math, plus
DimGray
Office Vol.3
calculate, math, Minus
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Things
Accounting, calculate, school
RosyBrown
Book, knowledge, education
LightSkyBlue
Orbicons (Free)
ruler, measure, pencil
YellowGreen
Higher Education Icon Set
mathematics, numbers, school
Gray
256x256