 Solution

Use $a,w,g,r$ for the agent, monster, gold and arrow, and abbreviate $s{q}_{ij}$ to $s_{ij}$. A physically safe STRIPS plan isEvery movement follows a listed adjacency predicate. The shot is taken from $s_{22}$ while the arrow is held, and kills the monster before entry into $s_{23}$. The pit at $s_{12}$ is never entered. The pickup establishes possession of the gold, and the last four movements restore the exit location while preserving that possession. Thus ten actions achieve the formal goal and the intended safe return; arriving at the exit is the source model’s representation of leaving.