
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 an arithmetic sequence $\{a\_n\}$ with the sum of its first $n$ terms denoted as $S\_n$, if $S\_4$, $S\_2$, and $S\_3$ form an arithmetic sequence, and $a\_2 + a\_3 + a\_4 = -18$, find the range of $n$ such that $S\_n \geqslant 2016$.

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