
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 certain series of books was published at intervals of seven years. When the seventh book was released, the sum of all the years in which the books in this series were published was 13,524. When was the first book of the series published?

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