Attempt Number: 4
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
Since passengers p4 and p6 are on floor 2 and both need to reach floor 2 in the goal state, we don't need to move them. We can focus on using the fast0 elevator at floor 4 to move the passengers p0 or p3 towards their destinations on floors 2 or 5 respectively. Let's board passenger p3 from floor 4 using fast0 since it is ready and moving towards floor 5.

New State Description:
- **fast0**: At floor 4 (n4), 1/2 passengers (with p3 on board).- **fast1**: At floor 0 (n0), 0/2 passengers, ready for new tasks if needed.- **slow0-0**: At floor 2 (n2), 0/1 passengers, idle.- **p0**: On floor 4 (n4), not yet onboard any elevator.- **p1**: On floor 1 (n1), still waiting.- **p2**: On floor 5 (n5), at destination.- **p3**: Onboard fast0 at floor 4 (n4), heading towards n5.- **p4**: On floor 2 (n2), at destination.- **p5**: On floor 0 (n0), at destination.- **p6**: On floor 2 (n2), at destination.

Action Chosen:
(board p3 fast0 n4 0 1)
