Parent State ID: 1
State Depth: 2
Action Taken: unstack(a, c)
Action Reasoning: To achieve the goal state, we need to put block d on block c. However, block c is not clear, so we should first unstack block a from block c to clear it.
State Description: Block d is in the hand. Block a is in the hand and clear. Block c is clear and on top of block b. Block b is on the table. The hand is holding block a.
Action Path: ['unstack(d, a)', 'unstack(a, c)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The hand is not empty, violating the precondition for unstack(a, c).
