Parent State ID: 8
State Depth: 5
Action Taken: stack(a, c)
Action Reasoning: To achieve the goal state, we need to build the stack in the order c, a, b, d. Since block a is clear and on the table, we can stack it on block c to start forming the base of the stack.
State Description: The hand is empty. Block c is on the table with block a on top of it. Block a is clear. Block b is on the table with block d on top of it. Block d 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: 
