Attempt Number: 2
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
The goal is to have block d on block c. Since the hand is holding block d and block c is clear, the best action is to stack d on c.

New State Description:
The hand is empty. Block a is on the table. Block b is on top of block a and is clear. Block c is on the table and is supporting block d. Block d is on block c and is clear.

Action Chosen:
stack(d, c)
