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

Action Reasoning:
To proceed toward the goal state, pick up block 'd', which is clear and necessary to achieve the stack configuration needed.

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

Action Chosen:
pick-up(d)
