
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 certain virus laboratory successfully isolated and cultured 60 strains of Omicron BA.1 virus, 20 strains of Omicron BA.2 virus, and 40 strains of Omicron BA.3 virus. Now, using a stratified random sampling method, a sample of size 30 is to be drawn from them. Then the number of Omicron BA.3 virus strains to be drawn should be ______.

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