
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
$\alpha$ and $\beta$ are two distinct planes. Among the following conditions, the one that can determine that planes $\alpha$ and $\beta$ are parallel is (fill in the serial number of the true statement):

① $m$ and $n$ are two lines within plane $\alpha$, and $m \parallel \beta$, $n \parallel \beta$;  
② $\alpha$ and $\beta$ are both perpendicular to plane $\gamma$;  
③ Three non-collinear points within $\alpha$ are equidistant from $\beta$;  
④ $m$ and $n$ are two skew lines, with $m \subset \alpha$, $n \subset \beta$, and $m \parallel \beta$, $n \parallel \alpha$.

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