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