What is the greatest whole number that MUST be a factor of the sum of any four consecutive positive odd numbers?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is the greatest whole number that MUST be a factor of the sum of any four consecutive positive odd numbers?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
8
What is the greatest whole number that MUST be a factor of the sum of any four consecutive positive odd numbers?
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