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RT @SpringerJapan: #idm314 Download a free chapter https://t.co/Uitcrh2cf7 from Springer eBook "Treks into Intuitive Geometry" Interview…
RT @SpringerJapan: #idm314 Download a free chapter https://t.co/Uitcrh2cf7 from Springer eBook "Treks into Intuitive Geometry" Interview…
秋山仁さん懐かしなあ ガキの頃、算数のやつ見てたよ
RT @SpringerJapan: #idm314 Download a free chapter https://t.co/Uitcrh2cf7 from Springer eBook "Treks into Intuitive Geometry" Interview…
RT @SpringerJapan: #idm314 Download a free chapter https://t.co/Uitcrh2cf7 from Springer eBook "Treks into Intuitive Geometry" Interview…