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the three R's (reading, writing and reckoning)
the alphabet of mathematics
規範文法.
a style of describing the history of a country based on the biographies of retainers
等差級数.
規範文法.
arithmetic in which computation proceeds by sixties, called sexigesimal arithmetic
十進法.
10進法.
a method of calculation called 'tsurukame-zan'
a program with a sunset provision