
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
During the World Expo, four students from a class participated in volunteer work. These four students were assigned to serve in three different pavilions, A, B, and C, with at least one person assigned to each pavilion. If student A requests not to be assigned to pavilion A, calculate the number of different assignment plans.

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