A ragged list is a (finite depth) list where each element is either a positive integer or a ragged list.
A ragged list is properly tiered if it contains either all positive integers or all properly tiered ragged lists.
[1,2,3,6] is properly tiered because it is a list of only positive integers.
[[1,2],[],[,[]]] is also properly tiered, because it has 3 elements which are all properly tiered lists themselves. Note that all the lists don't have to be the same depth.
[[1,2],[,4]] is not properly tiered because one of it's elements is a ragged list which contains a mixture of lists and positive integers.
Take a ragged list via any natural format and determine if it is a properly tiered list. You should output one of two consistent values, the first if the input is a properly tiered list and the second if it is not.
This is code-golf so your goal is to minimize the size of your source code as measured in bytes.
 -> Yes [1,2,3,6] -> Yes [[1,2],[],[,[]]] -> Yes [] -> Yes [1,] -> No [[1,2],[,4]] -> No [[1,],[,4]] -> No [1,] -> No