
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 the geometric sequence $\{a_n\}$ has $a_1=2$ and the common ratio $q=-2$, let $\pi_n=a_1 \times a_2 \times \ldots \times a_n$. Among $\pi_8$, $\pi_9$, $\pi_{10}$, $\pi_{11}$, determine the largest value.

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