Attempt Number: 3
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
We should move fast0 up to floor n1 to pick up passengers p1 and p4, as they need to reach floor n3, which fast0 can access directly.

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)
