The conversation between human and AI assistant.
[|Human|] Which element will become the results after the following mutation operation is applied?
[|AI|] The resulting elements after the mutation operation being applied will be: 1, 2, 3, 5, and 6 in a list form, resulting in [1, 2, 3, 5, 6]. The nested list [3,4] has been replaced by the value 3.
[|Human|] 
Which element will become the results after the following mutation operation is applied?