
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
If swapping "plane" with "line" and "line" with "plane" in a true statement still results in a true statement, then this statement is called "interchangeable statement". Among the following four statements:  
① Two lines perpendicular to the same plane are parallel; ② Two planes perpendicular to the same plane are parallel;  
③ Two lines parallel to the same line are parallel; ④ Two lines parallel to the same plane are parallel.  
The ones that are "interchangeable statements" are. (Fill in the numbers of the statements)

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