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

Action Reasoning:
To move closer to the goal state, I will stack block d on the table because it will free the hand and set up the correct base for block a.

New State Description:
Block d is now on the table and clear. Block a is clear and on the table. Blocks b and c remain clear and on the table. The hand is empty.

Action Chosen:
put-down(d)
