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Abacus Mental Arithmetic Ep.12 - Combo rules : -9,-8,-7,-6
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Abacus Mental Arithmetic Ep.5 - 10's rules : +9,+8,+7,+6 (中文 sub)
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Lesson 3 - Abacus Worksheet Help
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Abacus Mental Arithmetic Ep.10 - 5's rules : -4,-3,-2,-1
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Abacus Mental Arithmetic Ep.9 - 5's rules : +4,+3,+2,+1
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