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I'm trying to understand all the scenarios to apply BEM and there is something I would like to clarify in my mindset about this method.

Ok, imagine that you need a btn-group to gather the button / anchor elements in a module. If the module is the father of all, then you might think this btn-group is a child so it would like this "module__btn-group" but what happen with the btn?, and what about if you need that btn-group styles to apply another module?, then you will need to copy the same css rules again and again?. I mean, all the inner elements must have a father block of his own?.

Thanks a lot for the help.