Parent State ID: 26
State Depth: 8
Action Taken: stack(b, a)
Action Reasoning: The goal is to stack block 'b' on block 'a'. Since the hand is already holding block 'b' and block 'a' is not clear, the next best action is to stack 'b' on 'a', which aligns with the goal state.
State Description: The hand is now empty. Block 'b' is on block 'a', making block 'b' clear. Block 'a' is supporting block 'b' and is not clear. Block 'c' is supporting block 'a' and is not clear. Block 'd' remains on the table and clear.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'put-down(d)', 'pick-up(a)', 'stack(a, c)', 'pick-up(b)', 'stack(b, a)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: Precondition for stack action not met: block 'a' is not clear.
