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

Action Reasoning:
Passenger p3 is on floor n4 with fast1, which has capacity for one more passenger. Boarding p3 will utilize the elevator's capacity efficiently and align with the plan.

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

Action Chosen:
(board p3 fast1 n4 n1 n2)
