be a whiz, be very good at something, be a natural, to have natural instincts for something, to have an inherent ability in something, to have instinctive talent in something, be in blissful ignorance, a state of not knowing and not wanting to know about unhappy things or possible problems, be in the dark, in a state of ignorance, be on another planet, to not give attention to what is happening around you and to think differently from other people, do something in one's sleep / with their eyes closed, do something very easily because you have done it many times, know it inside out, to know something completely, know something like the back of their hand, to have very good and detailed knowledge of something, not know the first thing about something, know absolutely nothing about it, not know the half of it, know that a situation is bad but do not know how serious it is

Task 3b

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