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: ________
  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: 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.
  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: ________
  Step 14: ________
  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: 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.
  Step 19: 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.
  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. Carry the cube with you for traversing the blue paths back over the water.
  B. On the last elevated zone before the exit door, go to the end of the hallway and shoot an orange portal into the white wall piece. This removes the blue beam pressing the cube against the wall button, causing the cube to drop into the lower beam.
  C. Shoot a blue portal at the previous wall (closest to the cube machine) so that the water can be crossed.
  D. Shoot a blue portal on the elevated part with the cube machine.
  E. Follow the new blue path and at the end of the hallway, step onto the platform on the left, entering Room 2.
  F. Activate the small button to drop a cube.
  G. Shoot a blue portal on the elevated part in front (not the one with the cube machine).
  H. Go through the portal and place the new cube on the ground for storing. Then go back through the portals.
  I. Destroy the cube in the side room by pressing the button left of the glass window.
  J. Shoot an orange portal into the wall next to where you stand and go through the portal to land in the niche.