Parent State ID: 24
State Depth: 9
Action Taken: unstack(d, c)
Action Reasoning: To achieve the goal state, block 'a' needs to be on top of block 'b'. First, we need to make block 'b' clear by moving block 'c' off it. Since block 'd' is clear and on top of block 'c', we can unstack 'd' from 'c'.
State Description: Block 'a' is on the table and clear. Block 'c' is on top of block 'b' and clear. Block 'b' is on the table. Block 'd' is held in the hand. The hand is not empty.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'put-down(a)', 'pick-up(d)', 'stack(d, c)', 'unstack(d, c)', 'stack(d, c)', 'unstack(d, c)']
