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  1. Piet Hein (scientist) - Wikipedia

  2. Piet Pieterszoon Hein - Wikipedia

  3. Piet Hein

  4. Piet Hein - The Poet Who Challenged Nazi Occupation - Poetry Is …

  5. Piet Hein:Danish mathematician, scientist, inventor, poet and author.

  6. Piet Heyn | Spanish Armada, Caribbean Raids, Privateering

  7. Piet Hein | Danish mathematician | Britannica

  8. Soma cube - Wikipedia

  9. Piet Hein - Wikipedia, den frie encyklopædi

  10. Piet Hein made short poems called "Grooks" - ECstep