
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 terms of the geometric sequence $\{a_n\}$ are all positive numbers not equal to 1, and the sequence $\{b_n\}$ satisfies $b_n = \ln a_n$,  
$b_3 = 18$, $b_6 = 12$, then the maximum value of the sum of the first $n$ terms of the sequence $\{b_n\}$ is $\boxed{132}$.

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