Parent State ID: 10
State Depth: 5
Action Taken: pick-up(a)
Action Reasoning: To achieve the goal state where block C is on block A, I will first pick up block A, as it is clear and on the table, preparing to stack block C on it.
State Description: Block a is held by the hand and is no longer on the table. Blocks b, c, and d remain on the table and clear. The hand is not empty.
Action Path: ['unstack(d, c)', 'put-down(d)', 'unstack(a, b)', 'put-down(a)', 'pick-up(a)']
