_block(arrays, max_depth, result_ndim, depth=0)
Internal implementation of block based on repeated concatenation. :None:None:`arrays` is the argument passed to block. :None:None:`max_depth` is the depth of nested lists within :None:None:`arrays` and :None:None:`result_ndim` is the greatest of the dimensions of the arrays in :None:None:`arrays` and the depth of the lists in :None:None:`arrays` (see block docstring for details).
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