Parent State ID: 31
State Depth: 8
Action Taken: stack(a, c)
Action Reasoning: To achieve the goal state, we need to place block 'a' on block 'c'. Since the hand is currently holding block 'a' and block 'c' is clear, the best action is to stack 'a' on 'c'.
State Description: The hand is now empty. Block 'a' is on block 'c', and block 'c' is no longer clear. Block 'b' is on the table with block 'd' on top of it, and block 'd' is clear. The diagram now shows block 'a' on block 'c'.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'stack(d, b)', 'pick-up(c)', 'put-down(c)', 'pick-up(a)', 'stack(a, c)']
