
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 visit of four foreign guests to a school, two security personnel are required. If the six people enter the school gate in sequence, and for safety reasons, the security personnel must be the first and the last to enter, then there are a total of _______ different arrangement plans for the entry order of the six people (answer in numerical form).

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