Parent State ID: 8
State Depth: 3
Action Taken: stack(block_d, block_c)
Action Reasoning: To achieve the goal state, block D needs to be on block C. Since block C is clear and block D is currently on the table, the next logical step is to stack block D on block C.
State Description: Block A is on the table and clear. Block B is on block D and clear. Block C is on the table and not clear. Block D is on block C and not clear. The hand is empty.
Action Path: ['unstack(block_b, block_c)', 'stack(block_b, block_d)', 'stack(block_d, block_c)']

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