
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?  
① The correlation coefficient $R^2$ is used to describe the regression effect, the larger the $R^2$, the better the fitting effect;  
② Inferring the properties of a sphere from the properties of a circle is an example of analogical reasoning;  
③ It is impossible to compare the magnitude of any two complex numbers;  
④ Flowcharts are often used to represent dynamic processes and usually have a "start" and an end.

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