Parent State ID: 2
State Depth: 3
Action Taken: pick-up(d)
Action Reasoning: To achieve the goal state, we need to stack block d on block c. First, we should pick up block d since it is clear and on the table, which prepares us to stack it on block c.
State Description: The hand is holding block d. Block a is on the table. Block b is on top of block a and is clear. Block c is on the table and clear. Block d is no longer on the table and is not clear.
Action Path: ['unstack(c, b)', 'put-down(c)', 'pick-up(d)']
