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The delimiter /should/ occur the same number of times on
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1) build a table of the frequency of each character on every line.
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3) use the mode of the meta-frequency to determine the /expected/
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4) find out how often the character actually meets that goal
5) the character that best meets its goal is the delimiter
For performance reasons, the data is evaluated in chunks, so it can
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additional chunks as necessary.
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