Attempt Number: 4
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
To achieve the goal state, we need to move block c to the table. The first step is to unstack block c from block b, which we can then put on the table.

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

Action Chosen:
unstack(c, b)
