
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
Given that $m$ and $n$ are two non-intersecting lines, and $α$, $β$, $γ$ are three non-intersecting planes. The following four propositions are given:
1. If $m \bot α$, $m \bot β$, then $α // β$;
2. If $α \bot γ$, $β \bot γ$, then $α // β$;
3. If $m \subset α$, $n \subset β$, $m // n$, then $α // β$;
4. If $m$ and $n$ are skew lines, $m \subset α$, $m // β$, $n \subset β$, $n // α$, then $α // β$.

Determine the true propositions.

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