describe an invention that appeared before computer

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describe an invention that appeared before computer.

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2014-11-28 VertFeuille 53.33 Check this speaking
2015-01-19 Saeed2 68.75 Check this speaking
2015-05-27 TSEB 60.00 Check this speaking
2020-04-18 Thanh Thanh 001 100.00 Check this speaking
2015-11-26 ielts.webster 70.00 Check this speaking
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