Extend

Concatenate two lists

>>> list1 = [1,2,3,4,5,6,7,8]
>>> list2 = [9,10,11]
>>> list1.extend(list2)
>>> list1
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 9, 10, 11]
>>> list2
[9, 10, 11]
>>>

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