
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
The numbers divisible by $9$ are written in ascending order: $9, 18, 27, 36, \ldots$. Under each number in this series, its digit sum is written.

a) At which position in the second row will the number 81 first appear?

b) What will appear earlier: the number 27 four times in a row or the number 36 once?

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