Parent State ID: 28
State Depth: 6
Action Taken: stack(d, a)
Action Reasoning: To achieve the goal state, we need block 'd' on the table so we can place block 'a' on top of it. Since 'd' is currently held, we should stack it onto block 'a', which is already clear on the table, aligning the configuration towards the goal.
State Description: Block d is now stacked on block a, which is on the table. Block a is not clear anymore as it is supporting block d. Block b remains on block c, and both are on the table. The hand is empty.
Action Path: ['unstack(c, b)', 'put-down(c)', 'pick-up(b)', 'stack(b, c)', 'unstack(d, a)', 'stack(d, a)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The action does not align with the goal state; block 'd' should be on the table, not on 'a'.
