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

Action Reasoning:
Passenger p4 is already on board fast0, so we can move directly to where they need to go. Since p4 needs to be on n3, moving fast0 up to n3 will advance us closer to the goal state while taking advantage of fast0's capacity effectively.

New State Description:
- fast0: Fast elevator at floor 3 (n3), 1/2 passengers, contains passenger p4.- fast1: Fast elevator at floor 0 (n0), 0/2 passengers, empty.- slow0-0: Slow elevator at floor 1 (n1), 0/1 passengers, empty.- slow1-0: Slow elevator at floor 3 (n3), 0/1 passengers, empty.- p0: On floor 1 (n1), not boarded.- p1: On floor 3 (n3), not boarded.- p2: On floor 2 (n2), not boarded.- p3: On floor 0 (n0), not boarded.- p4: On board fast0 at floor 3 (n3).- p5: On floor 2 (n2), not boarded.

Action Chosen:
move-up-fast(fast0, n1, n3)
