[Haskell-cafe] Query on list comprehension

[Melanie_Green]

What are the limitations of list comprehension. I want to use
listcomprehension to output the pattern below. So a mixture of a's and
newline characters. The part im stuck at is creating arguments in the
listcomprehension to stop at some point then execute next loop. Is it even
possible to create the pattern below purely from list comprehension.Thankyou
in advance. 

a
aa
aaa
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