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Thus , the regular polyhedrathe ( convex ) Platonic solids and ( star ) Kepler–Poinsot polyhedraform dual pairs , where the regular tetrahedron is self-dual .
 Platonic, Kepler–Poinsot
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Platonic, Kepler–Poinsot