Question: Write a sml function flatten that takes a list of lists and return a flattened list. For example, flatten [[1,2], [3], [4,5,6]] should return [1,2,3,4,5,6].

Write a sml function flatten that takes a list of lists and return a flattened list. For example, flatten [[1,2], [3], [4,5,6]] should return [1,2,3,4,5,6].

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