Parent State ID: 18
State Depth: 9
Action Taken: stack(a, c)
Action Reasoning: To get closer to the goal state, we should stack block 'a', which is clear, onto block 'c', which is also clear and on the table.
State Description: The hand is empty. Block 'a' is now on top of block 'c' and is clear. Block 'c' is supporting block 'a' and remains on the table. Blocks 'b' and 'd' remain clear and on the table.
Action Path: ['unstack(b, c)', 'put-down(b)', 'unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'put-down(d)', 'pick-up(c)', 'put-down(c)', 'stack(a, c)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The hand is not holding block 'a'.
