Parent State ID: 8
State Depth: 5
Action Taken: stack(a, c)
Action Reasoning: To achieve the goal state, we need to stack block 'a' on block 'c'. Since both blocks 'a' and 'c' are clear and on the table, the next logical step is to stack 'a' on 'c'.
State Description: The hand is empty. Block a is on block c and is clear. Block b is on the table with block d on top of it. Block c is on the table and is supporting block a. Block d is on block b and is clear.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'stack(d, b)', 'stack(a, c)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The precondition that the hand must be holding block 'a' is not satisfied.
