Parent State ID: 22
State Depth: 5
Action Taken: stack(block_c, block_d)
Action Reasoning: The next best action is to "stack(block_c, block_d)" because block C needs to be at the bottom of the stack in the goal state, and block D is currently clear and on the table, allowing us to build the stack in the correct order.
State Description: Block A is on the table and is clear. Block B remains on block D and is clear. Block C is on block D and is clear. Block D is not clear and is on the table. The hand is empty.
Action Path: ['unstack(block_b, block_c)', 'stack(block_b, block_d)', 'pick-up(block_a)', 'put-down(block_a)', 'stack(block_c, block_d)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: Preconditions for the action are not satisfied: the hand is not holding block_c, and block_d is not clear.
