
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
Given that student A is selected to participate in the school's 4x100m relay race and can run either the 1st leg or the 4th leg, and student B cannot run the 1st leg, determine the number of suitable selection methods to choose the remaining 2 representatives from the 4 remaining students.

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