
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 has produced 5,000 units of a certain product from three different production lines: A, B, and C. To check the quality of this batch of products, it has been decided to use stratified sampling. If the numbers of units sampled from production lines A, B, and C are in the ratio of 1:2:2, then production line B has produced $\boxed{2000}$ units of the product.

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