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Symbol sorting can contain some literal or literal intervals. To describe literal intervals the '-' symbol is used which is staying between the first and last symbol in an interval. Examples of different intervals of one symbol sorting are as follows: [1-5] - digits from 1 to 5, [a-f] - Latin letters from a to f, [a-fq-x] - Latin letters from a to f and from q to x, two ranges are in use in the last symbol sorting. 

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