open books are stack the desk against background chalk board difficult homework school mountain knowledge |
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| navigate by keyword : academy auditorium back background blackboard blank board book chalk chalkboard class classroom college concept desk educate education elementary empty equipment green homework knowledge learn library literature notebook office pencil pile piled school science stack stacked student study studying supplies table textbook university wisdom workbooks |
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| Open books are mountain on the desk, against the background of a chalk board. Difficult homework at school, a mountain of knowledge |
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