user_prompt: ## Instruction:
  You enter Room 1, which has an elevation on the right containing a cube machine. In front, there is another elevation with two subsequent shield wall doors. Both shield walls are controlled by a button on the floor. Pressing the button toggles activation between the two shield walls: by default, the left wall is activated, and the right wall is deactivated.
  
  A blue path allows traversal across several corridors of water to enter Room 2.
  
  Room 2 consists of two main sections:
  - The left section contains a cube machine that drops a cube onto a jumper. The cube machine is activated by a small button located nearby.
  - The main hall of Room 2 features two button slots. When both slots are occupied, the exit door, which is elevated in the air, opens.
  
  Select the correct options for each blank. Only output option letters one by one, with the format '{Option 1}{Option 2}{Option 3}{Option 4}{Option 5}, such as 'ABCDE'
  Step 1: Shoot an orange portal on the wall where the blue path source hits.
  Step 2: ________
  Step 3: Go through the orange portal to walk over the elevated blue path to the elevated zone with the cube machine.
  Step 4: Activate the small button to drop a cube.
  Step 5: Place the cube on the elevated blue path vertically above the large red button.
  Step 6: Walk over to the elevated zone in front (with the two shield walls) and step between the two walls. Turn around and shoot a blue portal into the wall behind the first shield wall door. This creates a blue path extending over the water. By activating the floor button in Room 1, the cube opens the second door.
  Step 7: Walk onto the blue path into the corridor with water. At the end of the hallway, turn left and shoot a new blue portal to extend the path perpendicularly to the right side.
  Step 8: ________
  Step 9: Shoot a blue portal on the bottom right side so that a blue path leads to the left part of Room 2.
  Step 10: Walk on this new blue path and step off onto the small platform at the end of the path.
  Step 11: ________
  Step 12: Walk to the button, press it, then turn around and walk into the middle of the path to catch the cube being thrown towards you by the jumper.
  Step 13: Go through the portal and place the new cube on the ground for storing. Then go back through the portals.
  Step 14: Shoot a blue portal at the previous wall (closest to the cube machine) so that the water can be crossed.
  Step 15: At the end of the path, shoot a portal into the wall on the right so that a new path leads over the water to the main part of Room 2.
  Step 16: Walk to the exit door and shoot a blue portal between the cube slots.
  Step 17: Fetch any cube left in Room 1 through the blue portal to be placed on the cube slot(s) in Room 2.
  Step 18: ________
  Step 19: ________
  Step 20: Turn left to glance through the entrance platform of Room 2 into the corridor that led to Room 1. Shoot a blue portal at the white wall opposite the exit door.
  Step 21: Walk onto the new blue path leading to the exit door, which is now open due to the activated cube slots. Problem solved.
  
  Please select from the following candidate choices. Your response should end with "The final answer is [answer]." where the [answer] is the choice of options. 
  A. Fetch the mirror cube that spawns in the main room and place it facing to the left (when looking at the glass window) into the teleport machine.
  B. Shoot a blue portal on the elevated part with the cube machine.
  C. Shoot a blue portal on the wall opposing the small button in front of the cube machine. Shoot an orange portal next to you in the wall and enter the portal to walk a blue path leading towards the small button that activates the cube machine.
  D. Follow the new blue path and at the end of the hallway, step onto the platform on the left, entering Room 2.
  E. Go back to the entrance of Room 2 by crossing the portals and going through the corridors over the water.
  F. Shoot a blue portal on the wall to the left of the cube machine so that a path leads over the water to this wall. Walk this path, then at the end, turn left and shoot a new blue portal so that the path leads to the small button.
  G. Jump onto the path and shoot a blue portal higher up on the opposing wall (of the left part of Room 2). Repeat this multiple times until you reach the level of the exit door.
  H. Shoot a blue portal on the elevated part in front (not the one with the cube machine).
  I. This opens the exit door. Go through it. Problem solved.
  J. Go back to the entrance of Room 2 and shoot a blue portal to create a path leading to the left part of Room 2.