Attempt Number: 4
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
The block 'd' needs to be placed on block 'b' to align with the goal state, and 'b' is clear, so stack 'd' onto 'b'.

New State Description:
The hand is empty. Block 'b' is supporting block 'd' and is no longer clear. Block 'd' is on block 'b' and is clear. Block 'a' is on block 'c' and is clear. Block 'c' is supporting block 'a' and is no longer clear. The diagram would show block 'd' on top of block 'b', and block 'a' on top of block 'c'.

Action Chosen:
stack(d, b)
