Parent State ID: 18
State Depth: 5
Action Taken: stack(block_d, block_c)
Action Reasoning: To reach the goal state, where block A is on block B, B on D, and D on C, the next best action is to stack block D on block C since block C must be the base of the stack, aligning with the goal state.
State Description: Block A is on the table and clear. Block B is on block C and clear. Block C is on the table and not clear. Block D is on block C and not 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_c)', 'stack(block_d, block_c)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The preconditions for the action "stack(block_d, block_c)" are not satisfied: the hand is not holding block D, and block C is not clear.
