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

Action Reasoning:
Moving fast1 from n3 to n5 with p2 brings p2 closer to its goal. This also sets fast1 on floor 5, which can help with future moves for p3 and others.

New State Description:
- Fast elevator `fast0` is at floor 0 with 0 passengers out of 2.- Fast elevator `fast1` is now at floor 5 with `p2` onboard, 1 passenger out of 2.- Slow elevator `slow0-0` is at floor 2 with `p4` onboard, 1 passenger out of 1.- Passenger `p0` is on floor 4.- Passenger `p1` is on floor 1.- Passenger `p2` is onboard `fast1` and has reached its target floor 5.- Passenger `p3` is on floor 4.- Passenger `p5` is on floor 5.- Passenger `p6` is on floor 2.

Action Chosen:
(move-up-fast fast1 n3 n5)
