Parent State ID: 8
State Depth: 5
Action Taken: pick-up(a)
Action Reasoning: To move towards the goal state, we need to stack block 'a' on block 'c'. First, we must pick up block 'a' from the table since it is clear and the hand is empty.
State Description: The hand is holding block 'a'. Block 'a' is no longer on the table or clear. Block 'b' is on the table with block 'd' on top of it. Block 'c' is on the table and clear. Block 'd' is on block 'b' and is clear.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'stack(d, b)', 'pick-up(a)']
