
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
Which of the following statements are correct? (Fill in all the correct serial numbers)  
① Acute angles are first quadrant angles;  
② Second quadrant angles are obtuse angles;  
③ The set of first quadrant angles is $\{ \beta | k \cdot 360° < \beta < 90° + k \cdot 360°, k \in \mathbb{Z} \}$;  
④ The set of first and third quadrant angles is $\{ \beta | n \cdot 360° < \beta < 90° + n \cdot 360°, n \in \mathbb{Z} \}$.

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