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### How can I automatically redefine user-defined expressions?

Dear all, I imported expressions from different worksheets using load_session() consecutively. Now the problem is that I used different notations in some of them, so in order to unify the notations, I created a dictionary with the equivalent expressions and would like to crawl through all user-defined expressions and redefine them by substituing with the dictionary. Minimal example:

load_session('ws1')