Parent State ID: 9
State Depth: 7
Action Taken: stack(a, c)
Action Reasoning: Block 'c' needs to be placed on the table as per the goal state. Since 'c' is already clear and on the table, we can directly stack block 'a' on top of 'c' to progress towards the goal.
State Description: The hand is empty. Block 'a' is on top of block 'c' and is clear. Block 'b' is clear and on the table. Block 'c' is supporting block 'a' and is on the table. Block 'd' is on block 'a' and is clear.
Action Path: ['unstack(b, c)', 'put-down(b)', 'unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'stack(d, a)', 'stack(a, c)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The hand is not holding block 'a', violating the precondition for the stack action.
