Parent State ID: 51
State Depth: 10
Action Taken: stack(b, d)
Action Reasoning: To bring the state closer to the goal, I will stack block 'b' on block 'd'. This creates the base for stacking 'a' and 'c' correctly while ensuring 'd' is still clear for further actions.
State Description: The hand is now empty. Block 'b' is on block 'd', and block 'd' is no longer clear. Block 'a' remains on block 'c', with 'a' clear and 'c' supporting 'a'.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'stack(d, b)', 'pick-up(c)', 'put-down(c)', 'pick-up(a)', 'stack(a, c)', 'pick-up(b)', 'stack(b, d)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: Action does not align with goal state's constraints.
