Parent State ID: 14
State Depth: 6
Action Taken: stack(c, a)
Action Reasoning: The best action is to stack block 'c' on block 'a' since 'a' is clear, which moves 'c' towards the base of the desired stack, progressing towards the goal state where 'c' is at the bottom.
State Description: The hand is empty. Block 'c' is on block 'a' and is clear. Blocks 'b' and 'd' are still on the table and clear. Block 'a' is no longer clear but is on the table. The diagram now shows 'c' on top of 'a'.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'put-down(d)', 'pick-up(c)', 'stack(c, a)']

INACTIVE REASON: Pruned in beam search
