
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
The seat number of one more student selected to participate in the activity using the method of systematic sampling from Class 1 is given that there are 55 students and the seat numbers of 4, 15, 26, and 48 have been selected, determine the seat number of the fifth student.

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