def METHOD_NAME(lists, left, right):
    if left == right:
        return lists[left]
    elif left < right:
        mid = left + (right - left) // 2
        l1 = METHOD_NAME(lists, left, mid)
        l2 = METHOD_NAME(lists, mid + 1, right)
        return mergeTwoLists(l1, l2)
    else:
        return None