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Mam, a właściwie mam nadzieję, że zadziała. Gdyby ktoś szukał rozwiązania to:

Imagine this situation: you just imported your full schedule for this semester into your main Google Calendar when you decide make some changes to your courses or want to switch to an iCal feed. In this and many other cases it would be nice if Google provided any form of undo import option. Unfortunately there is no automated way of