Parent State ID: 3
State Depth: 4
Action Taken: stack(d, c)
Action Reasoning: The goal is to place block d on block c. Since the hand is currently holding block d and block c is clear, the best action is to stack d on c.
State Description: The hand is empty. Block a is on the table. Block b is on top of block a and is clear. Block c is on the table and is supporting block d. Block d is on top of block c and is clear.
Action Path: ['unstack(c, b)', 'put-down(c)', 'pick-up(d)', 'stack(d, c)']
