Parent State ID: 3
State Depth: 3
Action Taken: unstack(a, b)
Action Reasoning: To achieve the goal of having block C on block A, we should first clear block A by moving it to the table.
State Description: Block a is on the table, block b is on the table, block c is on the table, and block d is on the table. Blocks a, c, and d are clear. Block b is clear. The hand is empty.
Action Path: ['unstack(d, c)', 'put-down(d)', 'unstack(a, b)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: 
