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The plot of "Dănilă Prepeleac" [3] centers on its eponymous hero, the youngest of two brothers. Unlike his sibling, depicted as a well-to-do peasant (chiabur) and a hardworking man, the destitute Dănilă is also "lazy" and "lackadaisical", resorting to borrowing from his relatives whatever he lacks around the house.
For forty years the arithmometer was the only type of mechanical calculator available for sale until the industrial production of the more successful Odhner Arithmometer in 1890. [8] The comptometer, introduced in 1887, was the first machine to use a keyboard that consisted of columns of nine keys (from 1 to 9) for each digit.
Texas Instruments TI-84 Plus, the most successful graphing calculator in terms of sales. A graphing calculator (also graphics calculator or graphic display calculator) is a handheld computer that is capable of plotting graphs, solving simultaneous equations, and performing other tasks with variables.