Attempt Number: 2
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
Following the given plan, the next action is to board passenger p4 onto fast0 at floor n1. This aligns with the goal of moving passengers to their destinations efficiently.

New State Description:
- **fast0**: A fast elevator currently at floor 1 (n1), with 2 passengers (p1 and p4) and a capacity of 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**: Onboard fast0 at floor 1 (n1).- **p2**: On floor 2 (n2).- **p3**: On floor 0 (n0).- **p4**: Onboard fast0 at floor 1 (n1).- **p5**: On floor 3 (n3).

Action Chosen:
(board p4 fast0 n1 n1 n2)
