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Nature
Flat
Universe
space, universe, Astronomy
DimGray
512x512
Education
science, education, Astronomy
solar system, planet, science
science, education, Observation
Business
School Collection
bookmark, Address book, Notebook
Address book, Notebook, Business
Degrees, maths, education
Book, Abc, education
Basket, education
school, Class, Eraser
Book, Books, Library
Furniture And Household, storage, furniture
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education, reading, study
Book, study, Literature
open book, education, reading
buttons, finances, calculator
reading, study, Literature
technology
maths, Calculating, Technological
science, education, Chemistry
Tasks, checking, Verification
chess, science, education
Tools And Utensils, Time And Date, Clock