Parent State ID: 28
State Depth: 6
Action Taken: pick-up(block_d)
Action Reasoning: To reach the goal state, block D needs to be on block C. Since block D is currently clear, we can pick it up and move it onto block C.
State Description: Block A is in the hand and is not clear. Block B is clear and remains on block D, which is no longer on the table. Block C is clear and on the table. Block D is being held and is not clear. The hand is holding block D.
Action Path: ['unstack(block_b, block_c)', 'stack(block_b, block_d)', 'pick-up(block_a)', 'stack(block_a, block_b)', 'unstack(block_a, block_b)', 'pick-up(block_d)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The hand is not empty, so the action `pick-up(block_d)` is invalid.
