
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 biology interest group of Class 2, Grade 9, cultivated a kind of microorganism. This microorganism doubles in quantity every day. After 10 days, the entire experimental bottle was filled with microorganisms. Then, after how many days was the volume of microorganisms half of the volume of the experimental bottle?

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