Attempt Number: 3
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
Block B is in hand and all other blocks need to be placed on Block C to form the stack for the goal state. Start by placing Block C so we can stack the other blocks.

New State Description:
Block A is on the table and clear. Block B is on the table and clear. Block C is on the table and clear. Block D is on the table and clear. The hand is empty.

Action Chosen:
put-down(block_b)
