Parent State ID: 21
State Depth: 8
Action Taken: put-down(c)
Action Reasoning: To achieve the goal state, we need to place block 'c' on the table so that block 'd' can be stacked on it. The next logical step is to put down block 'c'.
State Description: Block 'a' is on the table and clear. Block 'b' is on the table and clear. Block 'c' is on the table and clear. Block 'd' is on the table and clear. The hand is empty. The diagram would show all blocks on the table, each marked as clear, with the hand empty.
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)']
