T么i kh么ng c么 膽啤n v矛 t么i c贸 nhi峄乽 b岷 b猫. Nh瓢ng t么i c么 膽峄檆 v矛 铆t ng瓢峄漣 hi峄僽 t么i !
If I feel unhappy, I do mathematics to become happy. If I'm happy, I do mathematics to keep happy !
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