Ravelling items of non-empty list is clear: $ ,. 1 2 3 3 1 For empty list it's slightly confusing for me: $ ,. i.0 0 1 Answer is an empty list of lists of length 1. But shouldn't it be of shape (0 0) instead? Empty list has no elements, so, ravelled empty list is empty list again: $ , i. 0 0 so the answer should be formed as empty list of empty lists.
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