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list_combine

Given two lists of integers "a" and "b", combine all of their numbers into a new list where all of the numbers from a appear before all of the numbers from b.

list_combine([1, 2, 3], [4, 5, 6]) → [1, 2, 3, 4, 5, 6]
list_combine([1, 2], [3, 4]) → [1, 2, 3, 4]
list_combine([1], [1, 1, 1]) → [1, 1, 1, 1]

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