Parent State ID: 1
State Depth: 2
Action Taken: put-down(d)
Action Reasoning: To achieve the goal state, we need to place block d on block c, which is currently not possible because block c is not clear. First, we should put down block d on the table to free the hand and then unstack block a from block c to clear it.
State Description: Block d is on the table and clear. Block a is clear and on top of block c. Block c is on top of block b. Block b is on the table. The hand is empty.
Action Path: ['unstack(d, a)', 'put-down(d)']
