Problem 4 Game tree. Assume an upward-pointing triangle is player MAX, and a downward-pointing triangle is player MIN. MAX wants to maximize its payoff, and MIN wants to minimize its payoff. 4.a The minimax values of the leaf nodes are given. Cross off the leaf nodes that will be pruned by Alpha-Beta pruning (assume the leaf nodes are visited from left to right). Show the derivation procedure on the graph. .