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

Action Reasoning:
The next action according to the plan is to board passenger p1 onto fast0 at floor n1, which aligns with moving passengers to their target destinations efficiently.

New State Description:
- fast0: At floor n1, 1/2 passengers (p1 on board).- fast1: At floor n0, 0/2 passengers.- slow0-0: At floor n0, 0/1 passengers.- slow1-0: At floor n3, 0/1 passengers.- p0: On floor n0.- p1: On board fast0.- p2: On floor n2.- p3: On floor n0.- p4: On floor n1.- p5: On floor n3.

Action Chosen:
(board p1 fast0 n1 n0 n1)
