
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 library has eight identical copies of a certain book. At least one copy of the book is supposed to remain in the library and at least one copy to be checked out at any given time. How many different possible configurations of the checked out and available books in the library are there?

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