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

Action Reasoning:
Next, we should put-down block 'c' onto the table to free the hand for moving other blocks which will help in stacking block 'c' onto the table as required by the goal.

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

Action Chosen:
put-down(c)
