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

Action Reasoning:
We need to continue following the given valid plan. At depth 7, the next action is to move fast0 up to floor 1 to board passengers p1 and p4.

New State Description:
- **fast0**: A fast elevator now at floor 1 (n1), with 0 passengers and capacity for 2.- **fast1**: A fast elevator at floor 0 (n0), with 0 passengers and 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**: On floor 2 (n2).- **p3**: On floor 0 (n0).- **p4**: On floor 1 (n1).- **p5**: On floor 3 (n3).

Action Chosen:
(move-up-fast fast0 n0 n1)
