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I am trying to find a solution to a problem in my researching workflow: When I read through long PDFs I want to highlight different kinds of sections in different colors. E.g. definitions in blue, stuff I want to research further in yellow etc., you get the idea. Now, which software let's me view only the highlights of a specific color?

My feeling is, this isn't such an exotic wish and not a feature so hard to implement, nonetheless I couldn't find anything.

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