Parent State ID: 11
State Depth: 6
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 empty. Block 'a' is on block 'c' and is clear. Block 'b' is on the table with block 'd' on top of it. Block 'c' is supporting block 'a' and is no longer clear. Block 'd' is on block 'b' and is clear.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'stack(d, b)', 'pick-up(a)', 'stack(a, c)']
