Python: Find identical items in multiple lists -

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I have a list of arbitrary list, for example: 

  [[1] , 2,3], [3,4,5], [5,6,7], [7, 8, 9]]

Now I have a list that includes everyone Elements that are present in more than one list: 

  [3,5,7]

How do I do this?

Thank you!

Just like you would do it by hand: 

  For the  seen = set () repeated = set (): I (L) in the set: if I saw: repeated. Add (i) other: seen.add (i)

By the way, there is a liner (without the count of imports) that some people were demanding (should be less efficient than other approaches) 

  reduce itertools by import (* Set. Inion, (strmp (set.intsection), combination (map (set, L), 2)))

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