Current State ID: 0
Current State Description: We have a building with floors labeled 0 through 4 (n0 to n4). Each floor nX is considered “above” any floor nY where X < Y, meaning n0 < n1 < n2 < n3 < n4 in ascending order.

There are four elevators:
- fast0, a fast elevator currently at floor 0 (n0). It has 0 passengers right now and has a maximum capacity of 2 passengers. It can reach all floors from 0 to 4 (n0 to n4).
- fast1, another fast elevator, currently at floor 3 (n3). It holds 0 passengers at the moment and can also hold up to 2 passengers. It can serve all floors from 0 to 4 (n0 to n4).
- slow0-0, a slow elevator currently at floor 1 (n1). It has 0 passengers and can hold up to 1 passenger. It can reach floors 0, 1, and 2 (n0 to n2).
- slow1-0, another slow elevator, currently at floor 3 (n3). It holds 0 passengers and can hold up to 1 passenger. It can serve floors 2, 3, and 4 (n2 to n4).

We have six passengers on specific floors:
- p0 is on floor 1 (n1).
- p1 is on floor 1 (n1).
- p2 is on floor 4 (n4).
- p3 is on floor 4 (n4).
- p4 is on floor 1 (n1).
- p5 is on floor 3 (n3).

Travel costs are as follows:
- Using a slow elevator costs 6 units per floor for some floors and 7 units for others. For example, going from n0 to n1 costs 6, and from n0 to n2 costs 7.
- Using the fast elevator between any of its reachable floors costs 4 units per floor for some floors and 7 units for others. For example, going from n0 to n1 costs 4, and from n0 to n2 costs 7.

The total cost starts at 0.

Child State ID: 1
Action Taken: board(p5, fast1, n3, 0, 1)
State Description: - fast0: Fast elevator at floor 0 (n0), 0/2 passengers.- fast1: Fast elevator at floor 3 (n3), 1/2 passengers (p5 on board).- slow0-0: Slow elevator at floor 1 (n1), 0/1 passengers.- slow1-0: Slow elevator at floor 3 (n3), 0/1 passengers.- p0: On floor 1 (n1).- p1: On floor 1 (n1).- p2: On floor 4 (n4).- p3: On floor 4 (n4).- p4: On floor 1 (n1).- p5: On board fast1 at floor 3 (n3).

Child State ID: 2
Action Taken: board(p5, slow1-0, n3, 0, 1)
State Description: - fast0: Fast elevator at floor n0, empty, capacity 2.- fast1: Fast elevator at floor n3, empty, capacity 2.- slow0-0: Slow elevator at floor n1, empty, capacity 1.- slow1-0: Slow elevator at floor n3, carrying passenger p5, capacity 1.- p0: On floor n1.- p1: On floor n1.- p2: On floor n4.- p3: On floor n4.- p4: On floor n1.- p5: Boarded on slow1-0 elevator.

Child State ID: 3
Action Taken: board(p0, slow0-0, n1, 0, 1)
State Description: fast0 is at floor 0 (n0), with 0 passengers. fast1 is at floor 3 (n3), with 0 passengers. slow0-0 is at floor 1 (n1), now boarding passenger p0 and has 1/1 passenger capacity. slow1-0 is at floor 3 (n3), with 0 passengers. Passenger p0 is onboard slow0-0. Passenger p1 is still on floor 1 (n1). Passenger p2 is on floor 4 (n4). Passenger p3 is on floor 4 (n4). Passenger p4 is on floor 1 (n1). Passenger p5 is on floor 3 (n3).

