
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]


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Five students, labeled A, B, C, D, and E, are arranged to participate in the volunteer service activity at the Sanming City Science Museum. Each person is responsible for one of the four tasks: reception, tour guiding, translation, and explanation. Each task must have at least one person assigned to it. A and B cannot be tour guides but can do the other three tasks. C, D, and E can handle all four tasks. The number of different arrangement schemes is _______.

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