
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
Professor Lin has ten different language books lined up on a bookshelf: two Arabic, four German, and four Spanish. Calculate the number of ways to arrange the ten books on the shelf keeping all books of the same language together.

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