Exercise 11.14

Consider the following problem: A patient arrives at the doctor’s office with symptoms that could have been caused either by dehydration or by disease $D$ (but not both). There are two possible actions: ${Drink}$, which unconditionally cures dehydration, and ${Medicate}$, which cures disease $D$ but has an undesirable side effect if taken when the patient is dehydrated. Write the problem description, and diagram a sensorless plan that solves the problem, enumerating all relevant possible worlds.