Parent State ID: 43
State Depth: 11
Action Taken: pick-up(d)
Action Reasoning: To achieve the goal state, block 'd' needs to be on top of block 'c'. Since block 'd' is clear and on the table, the next step is to pick it up.
State Description: Block 'a' is on top of block 'b'. Block 'b' is on the table and supporting block 'a'. Block 'c' is on the table and clear. Block 'd' is held in the hand. The hand is not empty. The diagram would show block 'a' on block 'b', block 'c' on the table, and block 'd' held by the hand.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'put-down(a)', 'pick-up(d)', 'put-down(d)', 'unstack(c, b)', 'put-down(c)', 'pick-up(a)', 'stack(a, b)', 'pick-up(d)']
