Parent State ID: 44
State Depth: 10
Action Taken: stack(d, b)
Action Reasoning: To achieve the goal state, we need to place block 'd' on block 'b'. Currently, the hand is holding block 'd', and block 'b' is clear, so we can directly stack 'd' on 'b'.
State Description: The hand is now empty. Block 'd' is on block 'b' and is clear. Block 'b' is not clear. Block 'a' is not clear. Block 'c' remains under block 'a' and is not clear. The diagram now shows block 'd' on top of block 'b', completing the stack.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'put-down(d)', 'pick-up(a)', 'stack(a, c)', 'pick-up(b)', 'stack(b, a)', 'pick-up(d)', 'stack(d, b)']
