Exercise 8.3 Write a complete description of the limited robot delivery world, and then draw a state-space representation that includes at least two instances of each of the blocks-world actions discussed in this chapter. Notice that the number of different arcs depends on the number of instances of actions.

Exercise 8.4 Change the representation of the delivery robot world [Example 8.1

(page 350)] so that

(a) the agent cannot carry both mail and coffee at the same time;

(b) the agent can carry a box in which it can place objects (so it can carry the box and the box can hold the mail and coffee).

Test it on an example that gives a different solution than the original representation.