{ucharclasses} should be used for questions related to the `ucharclasses` package that allows executing commands when changing from one Unicode block to another .

ucharclasses is a package that takes care of switch­ing fonts or, more generally, to execute commands when you switch from one Uni­code block to an­other in the text of a doc­u­ment. This way, you can for instance write a doc­u­ment with no ex­plicit font se­lec­tion.

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