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

Action Reasoning:
The next action in the plan is to move fast1 down from n2 to n0 with p3 on board, aligning with the goal of getting p3 to floor n0.

New State Description:
- fast0: At floor n0, 0/2 passengers.- fast1: At floor n0, 1/2 passengers (p3 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 floor n2.- p3: On board fast1.- p4: On floor n1.- p5: On floor n3.

Action Chosen:
(move-down-fast fast1 n2 n0)
