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Legend has it that Bricklin was watching his university professor create a table of calculation results on a blackboard. When the professor found an error, he had to tediously erase and rewrite a number of sequential entries in the table, triggering Bricklin to think that he could replicate the process on a computer, using a blackboard/spreadsheet paradigm to view results of underlying formulas.
Later, more powerful clones of VisiCalc include SuperCalc[?], Borland Quattro Pro, Lotus 1-2-3 and Microsoft Excel.
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