The partner in charge of the Kappeler Corporation audit comes by your desk and leaves a letter he has started to the CEO and a copy of the cash flow statement for the year ended December 31, 2017. Because he must leave on an emergency, he asks you to finish the letter by explaining: (1) the disparity between net income and cash flow, (2) the importance of operating cash flow, (3) the renewable source(s) of cash flow, and (4) possible suggestions to improve the cash position.