In Section conformant-section we introduced belief states to solve sensorless search problems. A sequence of actions solves a sensorless problem if it maps every physical state in the initial belief state $b$ to a goal state. Suppose the agent knows $h^*(s)$, the true optimal cost of solving the physical state $s$ in the fully observable problem, for every state $s$ in $b$. Find an admissible heuristic $h(b)$ for the sensorless problem in terms of these costs, and prove its admissibilty. Comment on the accuracy of this heuristic on the sensorless vacuum problem of Figure vacuum2-sets-figure. How well does A* perform?

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