Parent State ID: 13
State Depth: 6
Action Taken: stack(c, a)
Action Reasoning: To achieve the goal state, I will stack block c on block a, making progress toward the final configuration where block a should be on block c and block b should be on block a.
State Description: The hand is now empty. Block c is stacked on block a, and block c is no longer clear. Block a is no longer clear as it supports block c. Block b remains on the table with block d on top of it. Block d is clear.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'stack(d, b)', 'pick-up(c)', 'stack(c, a)']

INACTIVE REASON: Pruned in beam search
