erlang - lists:append with list comprehensions -

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How do I define lists: list work with an understanding of the list?

I want something 

  1> Attached ([[1, 2, 3], [A, B], [4, 5, 6]]). [1,2,3, A, B, 4,5,6]    
 
 
 Remember that you can use the elements in the generator after a generator in the same list!  
  1> Lists = [[1, 2, 3], [A, B], [4, 5, 6]]. [[1,2,3], [A, B], [4,5,6] 2 & gt; [N || || L & LT; - List, N & LT; - L]. [1,2,3, A, B, 4,5,6]

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