
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
A factory produced 13,200 units of a certain product, which came from three production lines: Line A, Line B, and Line C. To check the quality of this batch of products, it was decided to use stratified sampling for inspection. It is known that the number of units sampled from A, B, and C form an arithmetic sequence. Determine the number of units produced by Line B.

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