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Levenshtein Distance
This online calculator measures the Levenshtein distance between two strings.
Hartley's formula
Hartley's formula to determine the amount of information contained in a message with length n.
Check Digit Mod 11 (ISBN-10 check digit)
This online calculator generates and validates check digit with mod11 algorithm, used by ISBN-10
Ancient PixelArt: CompuServe RLE file viewer
This online calculator can parse and display images from CompuServe graphics files in RLE format
Gray code converters
These online calculators convert to and from the binary reflected in the Gray code and can produce a table for an n-bit Gray code
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