
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
In the study of the relationship between smoking and lung disease, the conclusion that "smoking is related to lung disease" was reached through data collection and analysis, with more than 99% confidence in this conclusion. Which of the following statements is correct:
① In 100 smokers, at least 99 people have lung disease;
② If one person smokes, then this person has a 99% probability of having lung disease;
③ In 100 smokers, there must be someone with lung disease;
④ In 100 smokers, it is possible that not a single person has lung disease. The correct statement(s) is/are __________.
(Fill in the correct statement number(s))

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