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, we need to stack block d on block c. First, we must pick up block d from the table.

New State Description:
The hand is holding block d. Block a is on the table. Block b is on top of block a and is clear. Block c is on the table and clear. Block d is no longer clear or on the table.

Action Chosen:
pick-up(d)
