
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
Consider an arithmetic sequence $\{a_n\}$ with a common difference of $d$ ($d$ is an odd number and $d > 1$). Let $S_n$ denote the sum of the first $n$ terms. If $S_{m-1} = -9$, $S_m = 0$, where $m > 3$ and $m \in \mathbb{N}^*$, find the expression for $a_n$.

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