Parent State ID: 17
State Depth: 7
Action Taken: unstack(d, b)
Action Reasoning: To move towards the goal state, we need to clear block 'b' by unstacking 'd' from 'b', allowing us to stack 'b' on 'a' later.
State Description: The hand is holding block 'd'. Block 'b' is now clear and on the table. Block 'a' is on block 'c' and is clear. Block 'c' is supporting block 'a' and is no longer clear.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'stack(d, b)', 'pick-up(a)', 'stack(a, c)', 'unstack(d, b)']
