Parent State ID: 1
State Depth: 2
Action Taken: stack(d, c)
Action Reasoning: To achieve the goal state, we need to place block d on block c. Since the hand is currently holding block d, the next best action is to stack d on c.
State Description: Block d is on top of block c, block a is clear and on top of block c, block c is on top of block b, and block b is on the table. The hand is empty.
Action Path: ['unstack(d, a)', 'stack(d, c)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: Block c is not clear, violating preconditions for stack(d, c).
