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 from the plan is to board passenger p5 onto fast1 at floor n5 with the capacity change from 0 to 1.

New State Description:
- fast0: At floor n0, 0/2 passengers.- fast1: At floor n5, 1/2 passengers, carrying p5.- slow0-0: At floor n2, 0/1 passengers.- p0: On floor n4.- p1: On floor n1.- p2: On floor n5.- p3: On floor n5.- p4: On floor n2.- p5: On board fast1.- p6: On floor n2.

Action Chosen:
(board p5 fast1 n5 n0 n1)
