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Set of closed and opened light doors isolated on white
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Carton delivery packaging open and closed box with fragile signs. Vector illustration isolatedon white background for web, icon, info graphic.
Human hands holding books. Readers with literature volumes, textbooks different positions, education and knowledge, back to school, nowaday vector cartoon flat isolated illustration set
Series and parallel electrical circuits. Parallel circuit, Series circuit, basic electric circuits experiment vector. Kirchhoff voltage law. series and parallel circuits with Batter and light bulb.

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