Parent State ID: 9
State Depth: 3
Action Taken: stack(block_d, block_b)
Action Reasoning: The next best action is to stack block D on block B, as block D is clear and the hand is empty. This aligns with our goal of having block D on top of block C, and then eventually getting block B and block A on top of this stack.
State Description: Block A is on the table and clear. Block B is on block C and not clear because it supports block D. Block C is on the table and not clear as it supports block B. Block D is on block B and clear. The hand is empty.
Action Path: ['unstack(block_b, block_c)', 'stack(block_b, block_c)', 'stack(block_d, block_b)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The hand is not holding block_d, and block_d should be on block_c, not block_b.
