Parent State ID: 14
State Depth: 6
Action Taken: put-down(c)
Action Reasoning: To achieve the goal state, block 'c' needs to be on the table. Since the hand is currently holding block 'c', the best action is to put it down on the table.
State Description: The hand is empty. Blocks a, b, c, and d are on the table and clear. Block c is now on the table and clear, reflecting the change in the diagram.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'put-down(d)', 'pick-up(c)', 'put-down(c)']

INACTIVE REASON: Pruned in beam search
