Parent State ID: 8
State Depth: 3
Action Taken: pick-up(block_d)
Action Reasoning: To complete the stack in our goal state, we should pick up block D first so that we can then place it onto block C. This will allow us to build the necessary layers.
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 clear. Block D is held by the hand 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_d)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: Block D is not clear, violating the precondition for pick-up.
