Parent State ID: 57
State Depth: 9
Action Taken: stack(block_d, block_c)
Action Reasoning: To achieve the goal state, we need to start stacking blocks. Since block C is already in the correct position on the table, we can focus on placing block D directly on top of block C.
State Description: Block A is on the table and clear. Block B is on the table and clear. Block C is on the table and supporting block D. Block D is on top of block C and clear. The hand is empty.
Action Path: ['unstack(block_b, block_c)', 'stack(block_b, block_d)', 'unstack(block_b, block_d)', 'stack(block_b, block_d)', 'unstack(block_b, block_d)', 'stack(block_b, block_c)', 'unstack(block_b, block_c)', 'put-down(block_b)', '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.
