
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
By analogy with the property in the plane that "two lines perpendicular to the same line are parallel to each other," the following conclusions can be drawn in space:

① Two lines perpendicular to the same line are parallel to each other;

② Two lines perpendicular to the same plane are parallel to each other;

③ Two planes perpendicular to the same line are parallel to each other;

④ Two planes perpendicular to the same plane are parallel to each other.

The correct conclusion(s) is/are numbered as           .

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