Parent State ID: 26
State Depth: 8
Action Taken: put-down(b)
Action Reasoning: To move towards the goal state, we need to place block 'b' on block 'a'. However, block 'a' is not clear. First, we should put down block 'b' to free the hand, then unstack block 'a' from block 'c' to make 'a' clear.
State Description: The hand is empty. Block 'b' is on the table and clear. Block 'a' is on block 'c', making block 'a' not clear. Block 'c' is supporting block 'a' and is not clear. Block 'd' remains on the table and clear.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'put-down(d)', 'pick-up(a)', 'stack(a, c)', 'pick-up(b)', 'put-down(b)']

INACTIVE REASON: Pruned in beam search
