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

Action Reasoning:
We need to move block A onto block B to match the goal configuration. Therefore, the next logical step is to pick up block A since it is clear and the hand is empty.

New State Description:
Block A is in the hand and no longer on the table. Block B is on block D and is clear. Block C is on the table and not clear because block D is on it. Block D is on block C and not clear. The hand is holding block A.

Action Chosen:
pick-up(block_a)
