
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
In the midterm exam, classmates A, B, C, and D ranked first, second, third, and fourth in their class, respectively. In the final exam, they were again the top four in their class. If their rankings were all different from those in the midterm exam, how many possible ranking scenarios could there be?

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