Elementary school wallpaper on telephone / page 14

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Happy child , happy parents

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Photo of the processor circuit with chips

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A woman teaches a boy to read

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Sad girl in a room with a rose

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A huge number of mathematical formulas on a gray background with a light center

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Three bright markers with eyes

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A famous scientist at the blackboard with formulas

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A scientist on the background of a blackboard with formulas

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Computer technology as a screen saver