But it's a list of lists of lists, so it should only contain lists of lists--well, by the strict definition, a nested list is still a list. So, technically I su

But it's a list of lists of lists, so it should only contain lists of lists--well, by the strict definition, a nested list is still a list. So, technically I suppose it can be there, but it reads as list of (lists of lists), where the depth of each level is clearly shown.