The programming language usually always improves with time, new functions are always added to the rules. If the rules have tendencies to be reused, the best way to achieve this is to use them as external rules, otherwise there would be the risk of having duplicate and outdated rules in the files, and updating them would be complicated. If a rule is specific to a particular file, it can not be reused, because it refers to this single file, and it would have to be modified to adapt it to another file.
As a recommendation I would tell you to get used to the use of external rules, avoiding copy and paste rules in multiple files. regards
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