Attempt Number: 2
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, block C needs to be on block B. First, we need to pick up block C so we can stack it on block B.

New State Description:
Block c is held in the hand. Block b is clear and on the table. Block a is on the table and is clear. Block d is on the table and is clear. The hand is not empty.

Action Chosen:
pick-up(c)
