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 fast0 up to floor n1 to pick up passengers p1 and p4. This aligns with the goal of transporting passengers to their destinations efficiently.

New State Description:
- fast0: At floor n1, 0/2 passengers.- 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 floor n1.- p2: On floor n2.- p3: On floor n0.- p4: On floor n1.- p5: On floor n3.

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