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in the file src/Course/ListZipper.hs, at line 412
-- If the focus cannot be moved, the given number of times, return the value by which it can be moved instead.
-- >>> moveLeftN' (-4) (zipper [5,4,3,2,1] 6 [7,8,9])
-- Left 3I think the excepted result should be Left -3, what do you think? the Same for moveRightN'
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