
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
Emily and Mark are both music enthusiasts. Their respective collections share fifteen of the same records. Emily has twenty-five records in her collection. Ten records are in Mark's collection, but not Emily's. How many records are in either Emily's or Mark's collection, but not both?

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