blue chalkboard with function mathematical icon isolated seamless pattern yellow background school blackboard sign |
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| navigate by keyword : back background banner billboard blackboard blank blue board business chalk chalkboard class classroom concept copy design dirty education empty flat frame function graphic icon illustration isolated learning lesson mathematics object old pattern retro rub school seamless sign space study symbol teacher teaching template university vector wood wooden write yellow |
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| Blue Chalkboard with function mathematical icon isolated seamless pattern on yellow background. School Blackboard sign. Vector Illustration. |
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