
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 middle school adopts the systematic sampling method to conduct dental health checks on 80 out of the 800 students in the first year. The students are numbered from 1 to 800. It is known that the number chosen from 31 to 40 is 39. Therefore, the number randomly chosen from the first group of 1 to 10 is __________.

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