Implement the function two_year_changesthat takes an array of murder rates for a state, ordered by increasing year. For all two-year periods (e. g., from 1960to 1962), it computes and returns the number of increases minus the number of decreases. For example, the array r = make_array(10, 7, 12, 9, 13, 9, 11)contains 3 increases (10 to 12, 7 to 9, and 12 to 13), 1 decrease (13 to 11), and 1change that is neither an increase or decrease (9 to 9). Therefore, two_year_changes(r)would return 2, the difference between 3 increases and 1 decrease. Hint: Consider using the diff_nfunction