
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 5000 units of a certain product, which came from three different production lines: A, B, and C. To check the quality of these products, it was decided to use stratified sampling. If the ratio of the number of units sampled from production lines A, B, and C is 1:2:2, then production line B produced \_\_\_\_\_ units of the product.

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