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, we need to place block 'd' on block 'b'. First, we must pick up block 'd' from the table since it is clear.

New State Description:
The hand is now holding block 'd'. Block 'b' is on block 'a' and is clear. Block 'a' is not clear. Block 'c' remains under block 'a' and is not clear. Block 'd' is no longer on the table and is not clear. The hand is not empty.

Action Chosen:
pick-up(d)
