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==basE91==
Uses 91 characters, and every pair of characters represents either 13 or 14 bits. Since 2^13 < 91*91 < 2^14, two characters can encode all 13-bit strings and some 14-bit strings; since 91*91=8281 and 2^13=8192, there are 89 combinations of two characters that are not used for representing strings of 13 characters. The particular choice is: for a string of 14 bits, if its lowest 13 represent a number greater than or equal to 89, the two characters are used to represent only these 13 bits; otherwise, 14 bits are encoded.
Do not move this explanation to the article; it is undocumented. - [[User:Paolo Liberatore|Liberatore]]([[User talk:Paolo Liberatore|T]]) 13: | |||