As in the preceding exercise, sketch the graph of the function passing through the relative maximum, $M,$ the relative minimum, $m$ and the inflection points

$I_{1}, I_{2}, I_{3},$ and $I_{4},$ as given in Figure $27 .$ Assume that the derivative fails to exist at $M,$ but $f^{\prime}(x)$ and $f^{\prime \prime}(x)$ exist everywhere else.