
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
Fifteen students are enrolled in both biology and chemistry courses. There are 35 students in the biology course. There are 18 students who are enrolled only in the chemistry course. How many students are enrolled in biology or chemistry but not both?

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