Parent State ID: 19
State Depth: 8
Action Taken: put-down(d)
Action Reasoning: To progress toward the goal state, we should first put block 'd' on the table. This will allow us to free up the hand, so we can later stack block 'a' on block 'b'.
State Description: Block 'a' is on the table and clear. Block 'c' is on top of block 'b' and clear. Block 'b' is on the table. Block 'd' is on the table and clear. The hand is empty.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'put-down(a)', 'pick-up(d)', 'stack(d, c)', 'unstack(d, c)', 'put-down(d)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: Action does not align with goal state's requirement for block 'd' to be on block 'c'.
