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

Action Reasoning:
Passenger p3 is already on board fast1 at floor n4, and the next step in the plan is to board passenger p2 onto fast1 at the same floor. This aligns with the goal of moving passengers efficiently to their destinations.

New State Description:
- fast0: At floor n0, 0/2 passengers.- fast1: At floor n4, 2/2 passengers (p3 and p2 on board).- slow0-0: At floor n0, 0/1 passengers.- slow1-0: At floor n3, 0/1 passengers.- p0: On floor n0.- p1: On floor n1.- p2: On board fast1.- p3: On board fast1.- p4: On floor n1.- p5: On floor n3.

Action Chosen:
(board p2 fast1 n4 n1 n2)
