Editing TeX
Typesetting language developed by DonaldKnuth. One of the best ways to create documents. Often combined with a macro package such as LaTeX. Perhaps one of the world's most bug-free programs. Its version number is asymptotically approaching pi (currently at about 3.14159). DonaldKnuth offers rewards to people who find bugs in TeX: checks for sums that are increasing powers of two (next bug to be found will receive $327.68). Knuth reports on [http://www-cs-faculty.stanford.edu/~knuth his web site]: "My last will and testament for TeX and METAFONT is that their version numbers ultimately become $\pi$ and $e$, respectively. At that point they will be completely error-free by definition."
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