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

Action Reasoning:
The goal is to have Block C on top of Block B. Since Block C is currently held in the hand and Block B is clear, the best action is to stack C on B.

New State Description:
Block C is on top of Block B and is clear. Block B is no longer clear. Blocks A and D are on the table and clear. The hand is empty.

Action Chosen:
stack(c, b)
