
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
Dr. Collector has eight different Marvel comic books, six different DC comic books, and seven different Manga comic books. Each group of comic books (Marvel, DC, Manga) is to be stacked together. In how many different orders can these 21 comic books be stacked in a pile with the covers facing up and all of them facing the same direction?

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