
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
There are the following four statements:
① Two lines perpendicular to the same line are parallel;
② Two planes perpendicular to the same line are parallel;
③ Two lines perpendicular to the same plane are parallel;
④ Two planes perpendicular to the same plane are parallel.
Among these statements, the correct ones are     . (Only need to fill in the serial numbers)

Present the answer in LaTex format: \boxed{Your answer}
user