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original_list = [1, 2, 3]
copied_list = original_list[:]
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k = []
# this above is sufficient: you do not need to specify how large your list is ahead of time
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list1 = [1, 2, 3]
list2 = [4, 5, 6]
concatenated_list = list1 + list2 # Output: [1, 2, 3, 4, 5, 6]