
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
Among the following conclusions, the correct one(s) is/are __________.

① The function $y=f(x)$ is an even function defined on $\mathbb{R}$, and $f(x+1)=-f(x)$. Thus, the graph of $y=f(x)$ is symmetric about the line $x=1$;  
② Given $\xi \sim N(16, \sigma^2)$, if $P(\xi > 17) = 0.35$, then $P(15 < \xi < 16) = 0.15$;  
③ Given $f(x)$ is an even function defined on $(-\infty, +\infty)$, and it is an increasing function on $(-\infty, 0]$. Let $a=f(\ln \frac{1}{3})$, $b=f(\log_{4}3)$, $c=f(0.4^{-1.2})$, then $c < a < b$;  
④ The closer the absolute value of the correlation coefficient $r$ is to 1, the weaker the degree of linear correlation between the two variables.

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