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

Action Reasoning:
The plan specifies that after both p2 and p3 board fast1 at floor n4, we should move fast1 down to n2. This action will position fast1 for the next step, where p2 will leave the elevator on floor n2.

New State Description:
- **fast0**: A fast elevator currently at floor 0 (n0), with 0 passengers and a capacity of 2.- **fast1**: A fast elevator now at floor 2 (n2), carrying passengers p2 and p3, and has a capacity of 2.- **slow0-0**: A slow elevator at floor 1 (n1), with 0 passengers and a capacity of 1.- **slow1-0**: A slow elevator at floor 3 (n3), with 0 passengers and a capacity of 1.- **p0**: On floor 1 (n1).- **p1**: On floor 1 (n1).- **p2**: Boarded on fast1 at floor 2 (n2).- **p3**: Boarded on fast1 at floor 2 (n2).- **p4**: On floor 1 (n1).- **p5**: On floor 3 (n3).

Action Chosen:
(move-down-fast fast1 n4 n2)
