Parent State ID: 31
State Depth: 10
Action Taken: stack(a, b)
Action Reasoning: To achieve the goal state, we need to place block 'a' on block 'b'. Since block 'a' is currently held, the best action is to stack 'a' on 'b', which is clear and on the table.
State Description: Block 'a' is on top of block 'b' and clear. Block 'b' is on the table and supporting block 'a'. Block 'c' is on top of block 'b' and supporting block 'd'. Block 'd' is on top of block 'c' and clear. The hand is empty.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'put-down(a)', 'pick-up(d)', 'stack(d, c)', 'unstack(d, c)', 'stack(d, c)', 'pick-up(a)', 'stack(a, b)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The new state visualization and text description incorrectly show block 'c' on block 'b'.
