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Basic knowledge in Signs & symbols category icons

Book
help, hint, knowledge, off, tip, tips
help, hint, knowledge, light, off, tip, tips
book, education, knowledge, learning, library
book, data, history, knowledge, read, words
book, education, knowledge, learning, library
help, hint, knowledge, light, roundedsolid, tip, tips
book, address, knowledge, library, read, school, university
book, bookmark, directory, knowledge, literature, read, study
help, hint, knowledge, light, on, tip, tips