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<DIR>   ..
<DIR>   djvu
<DIR>   pdf
         -> Two Tricks with Arithmetic, Perelman & Gardner.pdf
<DIR>   scans
<DIR>   text
         -> Multiplication on your computer, and how integer overflow happens.ascii.txt.utf-8.txt
         -> Do you see addition in the multiplication table.ascii.txt.utf-8.txt
         -> multiplication table.generator.pl (more in 'text'...)