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  1. Physical methods for purifying substances

  2. Physical phenomena and properties

  3. Physical methods for purifying substances

  4. Physical phenomena and properties

  5. The Sphere. Solids Inscribed in the Sphere

  6. Multiplication of natural numbers

  7. The order of operation performing with or without parentheses

  8. The Relative Positions of a Line Relative to a Plane

  9. Geometrical bodies

  10. The Relative Positions in Space of Two Lines

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