Write a function to return the average of a sequence of numbers by removing one maximum and one minimum value and the average without elements removed. If there are repeating maximum or minimum numbers, only remove one of them. The function should accept any number of elements in the sequence as input. The output should have two variables: average1, the average with one minimum and one maximum value removed; and average0, the average without any elements removed. Test your function with sequence [1, 2, 6, 9, 5, 9] (you should remove only one of the 9s and 1). You must write a Matlab function to complete the task.