[Haskell-cafe] lists of arbitrary depth

[vadali]

hello, 
iam really new to haskell, 

i want to define a function which takes as a parameter a list which can
contain other lists, eg. [1,[2,3],[4,[5,6]]]

how would i define a function that can iterate through the items so (in this
example)
iter1 = 1
iter2 = [2,3]
iter3 = [4,[5,6]]

?

( can i do that without using the Tree data type? )

THANKS!

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