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Let’s update our merge_sort() function so that it returns a sorted list finally!
Instructions
1.
In merge_sort() create two new variables: left_sorted and right_sorted.
left_sorted should be the result of calling merge_sort() recursively on left_split.
right_sorted should be the result of calling merge_sort() recursively on right_split.
2.
Erase the “return” line and change it to return the result of calling merge() on left_sorted and right_sorted.
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