给大家带来一些眉毛上的痣代表什么的新闻。如果你感兴趣，让我们一起来了解一下吧！
I am looking for a mutable (balanced) tree/map/hash table in Haskell or a way how to simulate it inside a function. I.e. when I call the same function several times, the structure is preserved. So far
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