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abacus

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abacus schools

abacus schools  

From the late thirteenth century onwards, many towns and guilds paid an ‘abacus master’ to teach mathematics to a given number of boys who intended to engage in commerce or ...
computer

computer  

Any device capable of carrying out a sequence of operations in a defined manner. The definition of the operations is called the program. An analog computer performs computations by manipulating ...

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