Question: Extracting unique values from sets in a list and inserting them in another list

I would like to extract the unique values of a few sets in a list (L1) and insert them in another list (L2) without the sets.

L1:=[{3,5},{5,4}]:

L2:=[3,5,4]:

Could anyone help me with a bit of code so this works for all values in sets in a list?

 

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