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

Action Reasoning:
To bring passenger p4 closer to the goal state, move fast0 from floor 2 to floor 4 (n4) where p4 needs to be. Fast0 is already on floor 2 with p4 onboard, minimizing moves and optimizing capacity.

New State Description:
- fast0: At floor 4 (n4), 1/2 passengers (p4 on board).- fast1: At floor 4 (n4), 0/2 passengers.- slow0-0: At floor 2 (n2), 0/1 passengers.- p0: On floor 2 (n2).- p1: On floor 1 (n1).- p2: On floor 5 (n5).- p3: On floor 4 (n4).- p4: On board fast0 at floor 4 (n4).- p5: On floor 0 (n0).- p6: On floor 2 (n2).

Action Chosen:
(move-up-fast fast0 n2 n4)
