
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
At a conference, a coordinator distributes draft documents to reviewers. The coordinator hands out documents in numerical order from 1 through 10, placing each new document on top of the previous ones in a pile. During a break, some reviewers take the top document to review. After returning from the break, only document number 9 has been confirmed as reviewed, but it is unknown which other documents, if any, were reviewed earlier. How many possible orders are there for the documents to be reviewed after the break concludes, given the conditions mentioned?

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