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maybe the profeesor meant to be as relaxed as possible
I see what you mean. If I just hold out my forearm and let my hand relax, it falls at about 45 degrees from horizontal. but I can't type in that position. To do so, my hand has to be more inline with forearm. But I do see and feel the difference compared to bending my hand upward. Maybe the author can ask the professor to be more specific?