Parent State ID: 39
State Depth: 9
Action Taken: unstack(a, c)
Action Reasoning: To achieve the goal state, we need to move block 'b' onto block 'a'. First, we should unstack 'a' from 'c' to make 'c' clear, allowing us to put 'b' on 'a' later.
State Description: The hand is holding block 'a'. Block 'c' is now clear and on the table. Block 'b' is supporting block 'd' and is not 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)', 'stack(a, c)', 'unstack(d, b)', 'stack(d, b)', 'unstack(a, c)']
