Final answer:
The most common way to diarise files in a law firm is by using electronic filing systems with date alerts via e-mail.
Step-by-step explanation:
The most common way to diarise files in a law firm is by using electronic filing systems with date alerts via e-mail. This allows for easy organization, retrieval, and tracking of files. It also provides notifications for important dates or deadlines related to the files.
Other methods, such as noting the date on the cover of the file with corresponding entries in the filing clerk's diary, using a cubbyhole system numbered 1 to 31, or preparing a card with numbers 1 to 31 for each file with a peg denoting the date file is needed, may still be used in some law firms but are less common in comparison.
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