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If part of your editing is checking continuity, it becomes difficult to search through 20 separate files for previous mentions of "Allen" to see if his hair (or lack of it) has been mentioned befor...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/32234 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/32234 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If part of your editing is checking continuity, it becomes difficult to search through 20 separate files for previous mentions of "Allen" to see if his hair (or lack of it) has been mentioned before Chapter 21, or if there was another character called "Allen", or if the receptionist was called "Mary" or "Marcy" the first time we met her.