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, first stack `c` onto the table to free the hand. Then, place `a` on top of `d` and `d` on top of `b`.

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(c)
