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==Other uses== * [[Photosystem I]], the second photosystem in the photosynthetic light reactions of plants * The name and designation for several public schools in the New York City Department of Education; see [[List of public elementary schools in New York City]] * [[Psalm 1]] from the Judeo-Christian Book of Psalms * The boxcar in the PS line of post-war standardized freight cars from [[Pullman-Standard]]
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