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French friend chicy study hand calculation fome
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Mr.Zhaozhizhong was teaching hand calculation for spical teachers in Nanning city,Guangxi province
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Spical teacher of blind-deaf in Taiyuan in 22 July,2002
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Fast calculation and check colculation
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Teacher Zhaozhizhong of Shanxi invent hand calculation and brain calculation
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Zhaozhizhong has extended hand calculation to childcare
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CongCong kndergarten students of Changzhi city was performing the hand calculation.
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National QingHua university school appoint expert of fast calculation:Zhaozhizhong
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QingHua univestry coopration with fast calculation of Changzhi
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