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[Subject: Geometry]
Translated by: DAVID LAURENT
Translated in 127 languages
Translated by: MARCO PRADELLI
Translated in 43 languages
[Subject: Social Interaction]
Translated in 21 languages
[Subject: Light & Paraphotic Phenomena]
Translated in 13 languages
[Subject: Generalities]
Translated in 7 languages
Translated in 24 languages