human biology - 8 abdominal muscles but 10 pack - Biology Stack Exchange

Simple question, how is it possible that there are people who appear to have 10 pack abdominal muscles while the human body has only eight?

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Are 8 pack abs possible? If so, which muscles are involved? - Quora

How to Build an 8 Pack Abs and Why Only a Few Have Them

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Hybrid (biology) - Wikipedia