b) Consider a modified version of the vacuum environment, in which the geography of the environmentits extent, boundaries, and obstaclesis unknown, as is the initial dirt configuration. (The agent can go Up and Down as well as Left and right) i. A vacuum-cleaner world with four locations. ii. Show the partial tabulation of a simple agent function for the vacuum-cleaner world Show the state space for the vacuum world. Links denote actions: L = Left, R = Right, U = Up, D = Down, S = Suck. =