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

Action Reasoning:
To progress towards the goal, we need to place block d on the table, which allows it to be a base for block a later. Stack action will follow after d is placed properly.

New State Description:
Block `a` is on the table and clear. Block `d` is on the table and clear. Block `b` is on the table supporting block `c`, which is clear. The hand is empty.

Action Chosen:
put-down(d)
